Fix spurious unused import warnings when import of export is used in creator application

[lihaoyi]

Fixes #24562

Tested manually on release-3.8.0, seems to make the spurious warning go away. Haven't tested on main since bin/scalac seems to be broken but the code looks about the same so hopefully it works as well

[som-snytt]

At the sbt prompt, the project has a scalac task.

For this issue, I wonder why it is typechecked as it is.

Ref says about export x.* that "eligible construtor proxies are also included, even though they are synthetic members."

[lihaoyi]

FTR this was largely vibe coded by claude, but I reviewed the final diff and it seems to make sense

> help me fix https://github.com/scala/scala3/issues/24562 and test it with 
JAVA_HOME=/Users/lihaoyi/Library/Caches/Coursier/arc/https/cdn.azul.com/zulu/bin/zulu17.62.17-ca-jdk17.0.17-macosx_aar
ch64.tar.gz/zulu17.62.17-ca-jdk17.0.17-macosx_aarch64/ bin/scalac -Wunused:all foo.scala 

∴ Thinking…

  The user wants me to fix a GitHub issue. Let me first fetch the issue to understand what needs to be fixed.

⏺ Fetch(url: "https://github.com/scala/scala3/issues/24562", prompt: "What is the bug report about? What is the issue,
       expected behavior, and reproduction steps?")
  ⎿  Received 240.6KB (200 OK)                                                                                     
# Scala 3 Bug Report Summary

## Issue Overview
This is a bug report filed against Scala 3 (issue #24562) describing incorrect compiler warnings for imports.

## The Problem
When using Scala 3's creator application syntax with exported symbols, the compiler incorrectly flags imports as
unused even though they are actively referenced in the code.

## Reproduction Case
The issue demonstrates two packages:
- Package `bar` exports `scala.util.Random`
- Package `foo` imports `Random` from `bar` and uses it in a `main()` function

Despite the `Random` being invoked in `println(Random(null))`, the compiler generates a warning: "unused import"
pointing to the `import bar.Random` line.

## Impact
This false positive causes downstream problems—specifically with scalafix, which interprets the warning and
automatically removes the import statement, breaking the code that depends on it. The reporter notes this disrupts
adoption of creator application syntax in the Mill build tool.

## Context
- **Compiler version affected:** 3.8.0-RC2
- **Root cause:** The compiler's unused import detection fails to recognize that an imported symbol, when sourced
through an export declaration, is actually in use

⏺ Read(file_path: "/Users/lihaoyi/Github/scala3/foo.scala")
  ⎿  Read 10 lines

∴ Thinking…

  Now I understand the issue. The problem is that when you import a symbol that's been exported from another package, and 
  you use it via "creator application syntax" (calling it like Random(null) instead of new Random(null)), the compiler 
  incorrectly flags the import as unused.

  Let me first run the reproduction to see the issue:

⏺ Let me first reproduce the issue and then explore the codebase to understand  12:50 AM  claude-opus-4-5-20251101
  how unused import warnings work.

⏺ Bash(JAVA_HOME=/Users/lihaoyi/Library/Caches/Coursier/arc/https/cdn.azul.com/zulu/bin/zulu17.62.17-ca-jdk17.0.17-macosx_
      aarch64.tar.gz/zulu17.62.17-ca-jdk17.0.17-macosx_aarch64/ bin/scalac -Wunused:all foo.scala 2>&1)
  ⎿  Building Dotty...                                                                                             
     [info] welcome to sbt 1.11.5 (Azul Systems, Inc. Java 17.0.17)
     [info] loading global plugins from /Users/lihaoyi/.sbt/1.0/plugins
     [info] loading settings for project scala3-build-build from build.sbt...
     [info] loading project definition from /Users/lihaoyi/Github/scala3/project/project
     [info] loading settings for project scala3-build from build.sbt, plugins.sbt...
     [info] loading project definition from /Users/lihaoyi/Github/scala3/project
     [info] compiling 2 Scala sources to /Users/lihaoyi/Github/scala3/project/target/scala-2.12/sbt-1.0/classes ...
     [info] done compiling
     [info] compiling 4 Scala sources to /Users/lihaoyi/Github/scala3/project/target/scala-2.12/sbt-1.0/classes ...
     [info] done compiling
     [info] loading settings for project scala3-nonbootstrapped from build.sbt...
     [info] resolving key references (33263 settings) ...
     git version 2.37.1 (Apple Git-137.1)
     [info] set current project to scala3-nonbootstrapped (in build file:/Users/lihaoyi/Github/scala3/)
     [error] Expected ID character
     [error] Not a valid command: dist-mac-aarch64
     [error] Expected project ID
     [error] Expected configuration
     [error] Expected ':'
     [error] Expected key
     [error] Not a valid key: dist-mac-aarch64
     [error] dist-mac-aarch64/Universal/stage
     [error]                 ^

∴ Thinking…

  There's some build issue. Let me try a different approach - let me see if there's already a compiled scalac or build it 
  properly.

⏺ Bash(JAVA_HOME=/Users/lihaoyi/Library/Caches/Coursier/arc/https/cdn.azul.com/zulu/bin/zulu17.62.17-ca-jdk1 timeout: 10m 
      7.0.17-macosx_aarch64.tar.gz/zulu17.62.17-ca-jdk17.0.17-macosx_aarch64/ sbt "scala3-compiler/compile"  0s
      2>&1 | tail -50)
  ⎿  Tool use rejected with user message: i changed branch, try again

∴ Thinking…

  Let me check the git status and try again with the bin/scalac command.

⏺ Bash(git status && git branch)
  ⎿  On branch release-3.8.0                                                     
     Untracked files:
       (use "git add <file>..." to include in what will be committed)
     	foo.scala

     nothing added to commit but untracked files present (use "git add" to track)
       backport-repl-dep
       dedented-strings
       embedded-repl
       embedded-repl-binary
       import-export-unused
       main
     * release-3.8.0
       repl-bindings

∴ Thinking…

  Okay, we're on the release-3.8.0 branch. Let me now run the bin/scalac command to reproduce the issue.

⏺ Bash(JAVA_HOME=/Users/lihaoyi/Library/Caches/Coursier/arc/https/cdn.azul.com/zulu/bin/zulu17.62.17-ca-jdk17 timeout: 5m 
      .0.17-macosx_aarch64.tar.gz/zulu17.62.17-ca-jdk17.0.17-macosx_aarch64/ bin/scalac -Wunused:all          0s
      foo.scala 2>&1)
  ⎿ Building Dotty...                                                                                                
    [info] welcome to sbt 1.11.5 (Azul Systems, Inc. Java 17.0.17)
    [info] loading global plugins from /Users/lihaoyi/.sbt/1.0/plugins
    [info] loading settings for project scala3-build-build from build.sbt...
    [info] loading project definition from /Users/lihaoyi/Github/scala3/project/project
    [info] loading settings for project scala3-build from build.sbt, plugins.sbt...
    [info] loading project definition from /Users/lihaoyi/Github/scala3/project
    [info] compiling 2 Scala sources to /Users/lihaoyi/Github/scala3/project/target/scala-2.12/sbt-1.0/classes ...
    [info] done compiling
    [info] compiling 4 Scala sources to /Users/lihaoyi/Github/scala3/project/target/scala-2.12/sbt-1.0/classes ...
    [info] done compiling
    [info] loading settings for project scala3 from build.sbt...
    [info] resolving key references (60468 settings) ...
    git version 2.37.1 (Apple Git-137.1)
    [info] set current project to scala3 (in build file:/Users/lihaoyi/Github/scala3/)
    [info] [republish] No extra properties to write.
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    (gz+https://github.com/VirtusLab/scala-cli/releases/download/v1.10.1/scala-cli-aarch64-apple-darwin.gz).
    [info] [republish] Using cached coursier.jar launcher
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    [info] Wrote /Users/lihaoyi/Github/scala3/interfaces/target/scala3-interfaces-3.8.0-RC2-bin-SNAPSHOT.pom
    [info] Wrote /Users/lihaoyi/Github/scala3/library/../out/bootstrap/scala3-library-bootstrapped/scala-3.8.0-RC2-bi
    n-SNAPSHOT-nonbootstrapped/scala3-library_3-3.8.0-RC2-bin-SNAPSHOT.pom
    [info] Wrote /Users/lihaoyi/Github/scala3/tasty/../out/bootstrap/tasty-core-bootstrapped/scala-3.8.0-RC2-bin-SNAP
    SHOT-nonbootstrapped/tasty-core_3-3.8.0-RC2-bin-SNAPSHOT.pom
    [info] Wrote /Users/lihaoyi/Github/scala3/compiler/../out/bootstrap/scala3-compiler-bootstrapped/scala-3.8.0-RC2-
    bin-SNAPSHOT-nonbootstrapped/scala3-compiler_3-3.8.0-RC2-bin-SNAPSHOT.pom
    [info] Wrote /Users/lihaoyi/Github/scala3/sbt-bridge/src/target/scala3-sbt-bridge-3.8.0-RC2-bin-SNAPSHOT.pom
    [info] Wrote /Users/lihaoyi/Github/scala3/staging/../out/bootstrap/scala3-staging/scala-3.8.0-RC2-bin-SNAPSHOT-no
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    [info] Wrote /Users/lihaoyi/Github/scala3/tasty-inspector/../out/bootstrap/scala3-tasty-inspector/scala-3.8.0-RC2
    -bin-SNAPSHOT-nonbootstrapped/scala3-tasty-inspector_3-3.8.0-RC2-bin-SNAPSHOT.pom
    [info] Wrote /Users/lihaoyi/Github/scala3/scaladoc/../out/bootstrap/scaladoc/scala-3.8.0-RC2-bin-SNAPSHOT-nonboot
    strapped/scaladoc_3-3.8.0-RC2-bin-SNAPSHOT.pom
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    [success] Total time: 11 s, completed 28 Nov 2025, 12:52:01 am

∴ Thinking…

  Hmm, the compilation seems to have succeeded without showing the warning. Let me check what was actually compiled and 
  see the output more carefully. Let me run the command again looking specifically for warnings.

⏺ The build succeeded but I don't see the warning. Let me check if there's      12:52 AM  claude-opus-4-5-20251101
  output showing the warning:

⏺ Bash(JAVA_HOME=/Users/lihaoyi/Library/Caches/Coursier/arc/https/cdn.azul.com/zulu/bin/zulu17.62.17-ca-jdk17.0.17-macosx_
      aarch64.tar.gz/zulu17.62.17-ca-jdk17.0.17-macosx_aarch64/ dist/mac-aarch64/target/pack/bin/scalac -Wunused:all
      foo.scala 2>&1)
  ⎿  Interrupted · What should Claude do instead?

                                                                                             12:53 AM  <synthetic>

> i fixed the repro code, try again 

∴ Thinking…

  The user fixed the reproduction code. Let me read it and try running the command again.

⏺ Read(file_path: "/Users/lihaoyi/Github/scala3/foo.scala")
  ⎿  Read 11 lines

⏺ Bash(JAVA_HOME=/Users/lihaoyi/Library/Caches/Coursier/arc/https/cdn.azul.com/zulu/bin/zulu17.62.17-ca-jdk17 timeout: 5m 
      .0.17-macosx_aarch64.tar.gz/zulu17.62.17-ca-jdk17.0.17-macosx_aarch64/ bin/scalac -Wunused:all          0s
      foo.scala 2>&1)
  ⎿  -- [E198] Unused Symbol Warning: foo.scala:5:13 --------------------------------
     5 |  import bar.Random
       |             ^^^^^^
       |             unused import
     1 warning found

∴ Thinking…

  Now I can see the issue. The import bar.Random is flagged as unused even though it's used in Random(null) (creator 
  application syntax). 

  Now I need to explore the codebase to understand how unused import warnings work and find where to fix this. The issue 
  is that when Random is used via creator application (calling the constructor without new), the compiler isn't 
  recognizing that the import is being used.

  Let me search for the unused import warning code in the compiler.

⏺ I can reproduce the issue. Now let me explore the codebase to understand how  12:53 AM  claude-opus-4-5-20251101
  unused import warnings work.

⏺ Explore(Find unused import warning code)
  ⎿  Prompt:                                                                                                         
       Search the Scala 3 compiler codebase for where unused import warnings are implemented. Look for:
       1. The warning message "unused import"
       2. Classes/files related to CheckUnused or similar
       3. How imports are tracked as used/unused

       Return the file paths and key function names involved in this feature.
  ⎿  Response:
       Perfect! Now let me create a comprehensive summary with all the findings:

       Summary: Unused Import Warning Implementation in Scala 3 Compiler

       I've successfully located and analyzed the unused import warning implementation in the Scala 3 compiler. Here
       are the key findings:

       1. Main Implementation Files

       Primary File:
       - /Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala (1,093 lines)

       Related Files:
       - /Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/reporting/messages.scala - Warning message
       definitions
       - /Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/typer/ImportInfo.scala - Import tracking and
       metadata
       - /Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/Compiler.scala - Phase integration

       2. Key Classes and Components

       Main Phase Classes:

       class CheckUnused(phaseMode: PhaseMode, suffix: String) extends MiniPhase
         - CheckUnused.PostTyper()    // Aggregates unused tracking (line 514)
         - CheckUnused.PostInlining() // Reports unused warnings (line 516)

       RefInfos Class (lines 518-577):

       Tracks all definitions, references, imports, and selectors:
       class RefInfos:
         val defs = mutable.Set.empty[(Symbol, SrcPos)]        // definitions
         val pats = mutable.Set.empty[(Symbol, SrcPos)]        // pattern variables
         val refs = mutable.Set.empty[Symbol]                  // references
         val asss = mutable.Set.empty[Symbol]                  // assignment targets
         val skip = mutable.Set.empty[Symbol]                  // methods to skip
         val nowarn = mutable.Set.empty[Symbol]                // @nowarn marked
         val imps = new IdentityHashMap[Import, Unit]          // imports
         val sels = new IdentityHashMap[ImportSelector, Unit]  // matched selectors

       3. Key Functions for Tracking Usage

       matchingSelector() (lines 346-386):

       Determines if an import selector matches a usage reference by checking:
       - Wildcard selectors
       - Unimports (exclusions)
       - Named imports with optional renames

       resolveUsage() (lines 342-448):

       Main tracking function that:
       - Looks up symbols in enclosing contexts
       - Determines whether they come from imports or definitions
       - Applies precedence rules (Definition > NamedImport > Wildcard > OtherUnit)
       - Records which import selectors are actually used via refInfos.sels

       refUsage() (lines 318-329):

       Records a reference to a symbol as "used"

       resolveScoped() (lines 453-480):

       Simulates implicit search for contextual implicits and marks them as used

       4. Warning Generation Functions

       warnings() (lines 597-928):

       Main function that generates all unused warnings with sub-checks:

       For Imports:
       - checkImports() (lines 762-902)
         - Identifies unused import selectors
         - Generates code actions for removal
         - Handles complex deletion scenarios

       For Definitions and Parameters:
       - checkPrivate() - unused private members
       - checkParam() - unused parameters
       - checkImplicit() - unused implicit parameters
       - checkLocal() - unused local definitions
       - checkUnassigned() - unassigned mutable variables
       - checkPatvars() - unused pattern variables

       reportUnused() (lines 591-593):

       Issues warnings for all unused symbols

       5. Warning Message Definitions

       In /Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/reporting/messages.scala (lines 3444-3466):

       class UnusedSymbol(errorText: String, val actions: List[CodeAction] = Nil)

       object UnusedSymbol:
         def imports(actions: List[CodeAction]): UnusedSymbol =
           UnusedSymbol(i"unused import", actions)
         def localDefs: UnusedSymbol = UnusedSymbol(i"unused local definition")
         def localVars: UnusedSymbol = UnusedSymbol(i"local variable was mutated but not read")
         def explicitParams(sym: Symbol): UnusedSymbol
         def implicitParams(sym: Symbol): UnusedSymbol
         def privateMembers: UnusedSymbol = UnusedSymbol(i"unused private member")
         def patVars: UnusedSymbol = UnusedSymbol(i"unused pattern variable")
         // ... more variants

       6. Integration into Compiler Pipeline

       In /Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/Compiler.scala:

       List(CheckUnused.PostTyper(), CheckShadowing()) :: // Line 36 - Aggregate phase
       List(new CheckUnused.PostInlining) ::              // Line 55 - Reporting phase

       7. Import Tracking Details (ImportInfo)

       The /Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/typer/ImportInfo.scala file provides:

       - site: The type being imported from
       - selectors: List of ImportSelector items
       - isWildcardImport: Whether import has _ wildcard
       - isGivenImport: Whether import has given keyword
       - forwardMapping: Maps original to renamed names
       - excludedNames: Names excluded from wildcards

       8. How Usage Tracking Works

       1. Aggregate Phase (PostTyper): Tree is traversed transforming Ident, Select, Import nodes, calling
       resolveUsage() which marks import selectors as "used" in refInfos.sels
       2. Report Phase (PostInlining): For each import selector in refInfos.imps, if NOT in refInfos.sels, it's
       reported as unused

       9. Test Files

       Example test cases demonstrating the feature:
       - /Users/lihaoyi/Github/scala3/tests/warn/i15503a.scala - Comprehensive test cases for unused import detection
  ⎿  Done (15 tool uses · 44.7k tokens · 44s)

∴ Thinking…

  Now I have a good understanding of the unused import warning system. The key is in CheckUnused.scala. The issue is that 
  when using creator application syntax with an exported symbol, the import isn't being marked as used.

  Let me look at the CheckUnused.scala file more closely to understand how imports are marked as used. The key function 
  seems to be resolveUsage() which tracks references and marks import selectors as used.

  The problem likely is that when creator application syntax is used (like Random(null) instead of new Random(null)), some
   symbol lookup is happening that doesn't go through the normal import resolution path.

  Let me read the CheckUnused.scala file to understand the issue better.

⏺ Read(file_path: "/Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala")
  ⎿  Read 1093 lines

∴ Thinking…

  Now I understand how the unused import check works. The key function is resolveUsage which matches references to import 
  selectors. Let me look at the specific case that's failing.

  The issue is:
  1. Package bar exports scala.util.Random
  2. Package foo imports bar.Random
  3. When we use Random(null) (creator application syntax - calling the apply method on the companion), the compiler 
  doesn't recognize the import as being used

  The problem is likely in the typer when creator application happens - the tree might not go through the normal 
  resolveUsage path because it gets transformed.

  Let me look for where creator application syntax is handled and where the symbol might get recorded. The "creator 
  application" in Scala 3 means you can call Random(null) instead of new Random(null) - the compiler creates an apply call
   on the companion object.

  Looking at the code, I see:
  - transformIdent handles identifier references
  - transformSelect handles selections
  - resolveUsage is what marks an import selector as used

  The issue is probably that when creator application happens (calling Random(null)), the desugaring transforms it in a 
  way that the original identifier referencing the imported Random no longer gets properly tracked.

  Let me search for how creator application is handled.

⏺ Let me search for how creator application works in the typer:                 12:54 AM  claude-opus-4-5-20251101

⏺ Search(pattern: "creator.*appl|CreatorApply", path: "/Users/lihaoyi/Github/scala3/compiler")
  ⎿  Found 1 file                                        
     compiler/src/dotty/tools/dotc/ast/DesugarEnums.scala

⏺ Search(pattern: "findApply|makeCreator|toApply", path: "/Users/lihaoyi/Github/scala3/compiler")
  ⎿  Found 1 file                                       
     compiler/src/dotty/tools/dotc/util/Signatures.scala

∴ Thinking…

  Let me search for how "apply" method is synthesized for type constructor applications.

⏺ Search(pattern: "def typedApply|ApplyTo.*companion|applyKind|adapt.*apply", path:
        "/Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/typer")
  ⎿  Found 5 files                                         
     compiler/src/dotty/tools/dotc/typer/Typer.scala
     compiler/src/dotty/tools/dotc/typer/ProtoTypes.scala
     compiler/src/dotty/tools/dotc/typer/Applications.scala
     compiler/src/dotty/tools/dotc/typer/EtaExpansion.scala
     compiler/src/dotty/tools/dotc/typer/Migrations.scala

∴ Thinking…

  Let me search for the specific logic that handles creator application, i.e., calling a type like Random(null) and 
  turning it into Random.apply(null) or new Random(null).

⏺ Search(pattern: "companion.*apply|select.*apply|findMember.*apply", path:
        "/Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/typer/Applications.scala", output_mode: "content")
  ⎿  Found 0 lines

∴ Thinking…

  Let me print the tree of the compiled code to see what's happening. I'll use -Xprint:typer to see the typed AST.

⏺ Let me print the typed AST to see what's happening:                           12:54 AM  claude-opus-4-5-20251101

⏺ Bash(JAVA_HOME=/Users/lihaoyi/Library/Caches/Coursier/arc/https/cdn.azul.com/zulu/bin/zulu17.62.17-ca-jdk17 timeout: 5m 
      .0.17-macosx_aarch64.tar.gz/zulu17.62.17-ca-jdk17.0.17-macosx_aarch64/ bin/scalac -Xprint:typer         0s
      foo.scala 2>&1 | head -60)
  ⎿  Option -Xprint is a deprecated alias: use -Vprint instead                     
     [[syntax trees at end of                     typer]] // foo.scala
     package <empty> {
       package bar {
         final lazy module val foo$package: bar.foo$package = new bar.foo$package()
         final module class foo$package() extends Object() {
           this: bar.foo$package.type =>
           export scala.util.Random
           final def Random: scala.util.Random.type = scala.util.Random
           final type Random = scala.util.Random
         }
       }
       package foo {
         import bar.Random
         final lazy module val foo$package: foo.foo$package = new foo.foo$package()
         final module class foo$package() extends Object() {
           this: foo.foo$package.type =>
           def main(): Unit =
             {
               println(new scala.util.Random(null))
             }
         }
       }
     }

     1 warning found

∴ Thinking…

  Now I see the issue. The code Random(null) is being desugared to new scala.util.Random(null) - the type Random is 
  resolved through the import, but the final result is new scala.util.Random(null) - a direct reference to the class, not 
  through the import.

  The import bar.Random brings in both:
  1. A type alias Random = scala.util.Random
  2. A term Random pointing to scala.util.Random.type (companion object)

  When we write Random(null), it's being typed as creator application, which ultimately becomes new 
  scala.util.Random(null). The issue is that the original Random identifier that was typed is replaced by the fully 
  qualified scala.util.Random in the output tree, and the unused import checker doesn't see the reference through the 
  import.

  Let me look at how the CheckUnused handles identifier transformations more closely. The key is in transformIdent - it 
  calls resolveUsage(tree.symbol, tree.name, tree.typeOpt.importPrefix.skipPackageObject, imports = resolving).

  The problem might be that:
  1. When Random(null) is typed, the Random is first typed as an identifier
  2. Then the creator application desugars it to new Random(null) or directly to new scala.util.Random(null)
  3. By the time CheckUnused sees it, the tree has been transformed and the original identifier referencing the import is 
  gone

  Let me check if there's a specific case for handling this. Let me print more details about the tree.

⏺ I see the issue. The Random(null) is being desugared to new                   12:56 AM  claude-opus-4-5-20251101
  scala.util.Random(null) directly, skipping the import. Let me check with more
   print options:

⏺ Bash(JAVA_HOME=/Users/lihaoyi/Library/Caches/Coursier/arc/https/cdn.azul.com/zulu/bin/zulu17.62.17-ca-jdk17 timeout: 5m 
      .0.17-macosx_aarch64.tar.gz/zulu17.62.17-ca-jdk17.0.17-macosx_aarch64/ bin/scalac                       0s
      -Vprint:checkUnusedPostTyper foo.scala 2>&1 | head -80)
  ⎿  (No content)

∴ Thinking…

  No output. Let me check what phases are available.

⏺ Bash(JAVA_HOME=/Users/lihaoyi/Library/Caches/Coursier/arc/https/cdn.azul.com/zulu/bin/zulu17.62.17-ca-jdk17 timeout: 5m 
      .0.17-macosx_aarch64.tar.gz/zulu17.62.17-ca-jdk17.0.17-macosx_aarch64/ bin/scalac -Xshow-phases 2>&1 |  0s
      head -40)
  ⎿  Option -Xshow-phases is a deprecated alias: use -Vphases instead                
                  phase name  description
                  ----------  -----------
                      parser  scan and parse sources
                       typer  type the trees
        checkUnusedPostTyper  check for unused elements
              checkShadowing  check for elements shadowing other elements in scope
            inlinedPositions  check inlined positions
                    sbt-deps  sends information on classes' dependencies to sbt
     extractSemanticDBExtractSemanticInfo
                              extract info into .semanticdb files
                   posttyper  additional checks and cleanups after type checking
                  unrollDefs  generates forwarders for methods annotated with @unroll
               prepjsinterop  additional checks and transformations for Scala.js
                 SetRootTree  set the rootTreeOrProvider on class symbols
                     pickler  generates TASTy info
                     sbt-api  sends a representation of the API of classes to sbt
                    inlining  inline and execute macros
                postInlining  add mirror support for inlined code
                     staging  check staging levels and heal staged types
                    splicing  splicing
                pickleQuotes  turn quoted trees into explicit run-time data
                              structures
     checkUnusedPostInlining  check for unused elements
          instrumentCoverage  instrument code for coverage checking
          crossVersionChecks  check issues related to deprecated and experimental
              firstTransform  some transformations to put trees into a canonical form
              checkReentrant  check no data races involving global vars
         elimPackagePrefixes  eliminate references to package prefixes in Select
                              nodes
                cookComments  cook the comments: expand variables, doc, etc.
       checkLoopingImplicits  check that implicit defs do not call themselves in an
                              infinite loop
                  betaReduce  reduce closure applications
                  inlineVals  check right hand-sides of an `inline val`s
                  expandSAMs  expand SAM closures to anonymous classes
                elimRepeated  rewrite vararg parameters and arguments
                   refchecks  checks related to abstract members and overriding
                  dropForMap  drop unused trailing map calls in for comprehensions
     extractSemanticDBAppendDiagnostics

∴ Thinking…

  Let me print the AST at checkUnusedPostTyper.

⏺ Bash(JAVA_HOME=/Users/lihaoyi/Library/Caches/Coursier/arc/https/cdn.azul.com/zulu/bin/zulu17.62.17-ca-jdk17 timeout: 5m 
      .0.17-macosx_aarch64.tar.gz/zulu17.62.17-ca-jdk17.0.17-macosx_aarch64/ bin/scalac                       0s
      -Vprint:checkUnusedPostTyper foo.scala 2>&1)
  ⎿  (No content)

∴ Thinking…

  Hmm, no output. Let me try another approach - let me check if there's something happening in the typer when creator 
  application happens. The issue is that when you write Random(null), the typer converts it to new scala.util.Random(null)
   and the tree that gets to CheckUnused doesn't contain a reference that shows it came from the import.

  Let me look for where creator application gets typed.

⏺ Let me search for the creator application logic:                              12:57 AM  claude-opus-4-5-20251101

⏺ Search(pattern: "new.*apply|adapt.*proto|tryInsert|adaptToApply", path:
        "/Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/typer/Typer.scala", output_mode: "content")
  ⎿  Found 10 lines                                                                                                 
     98:   *  that was added by tryInsertImplicitOnQualifier. Needed to prevent infinite
     1673:          newTypeVar(apply(bounds.orElse(TypeBounds.empty)).bounds)
     2402:                            // Hence no adaptation is possible, and we assume WildcardType as prototype.
     4055:  def tryInsertApplyOrImplicit(tree: Tree, pt: ProtoType, locked: TypeVars)(fallBack: => Tree)(using
     Context): Tree = {
     4084:      tryInsertImplicitOnQualifier(tree, pt.withContext(ctx), locked).getOrElse(fallBack)
     4115:  def tryInsertImplicitOnQualifier(tree: Tree, pt: Type, locked: TypeVars)(using Context): Option[Tree] =
     trace(i"try insert impl on qualifier $tree $pt") {
     4135:        tryInsertImplicitOnQualifier(fn, pt, locked)
     4322:              tryInsertApplyOrImplicit(tree, pt, locked)(errorNoMatch)
     4375:        tryInsertApplyOrImplicit(tree, pt, locked):
     5056:              tryInsertApplyOrImplicit(tree, pt, locked)(tree) // error will be reported in typedTypeApply

∴ Thinking…

  Let me look at tryInsertApplyOrImplicit to understand how creator application works.

⏺ Read(file_path: "/Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/typer/Typer.scala", offset: 4050, limit:
      120)
  ⎿  Read 120 lines

∴ Thinking…

  I see. tryApply does typedSelect(untpd.Select(untpd.TypedSplice(tree), nme.apply), pt1). This creates a select of .apply
   on the tree. The tree was already typed (it's a TypedSplice).

  Let me look at how creator application specifically works. The issue is when you call Random(null) on a class type, it 
  should create a new expression. Let me search for that.

⏺ Search(pattern: "nme.apply|typedNew|adaptTo.*New", path:
        "/Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/typer/Applications.scala", output_mode: "content")
  ⎿  Found 20 lines                                                                                         
     125-    def toSeqTp(elemTp: Type) = ExprType(defn.CollectionSeqType.appliedTo(elemTp))
     126-
     127-    / the result type of `def apply(i: Int): T`
     128:    val elemTp = getTp.member(nme.apply).suchThat(_.info <:< applyTp(WildcardType)).info.resultType
     129-
     130-    def hasMethod(name: Name, tp: Type) =
     131-      getTp.member(name).suchThat(getTp.memberInfo(_) <:< tp).exists
     --
     365-   */
     366-  def findDefaultGetter(meth: TermSymbol, receiver: Tree, idx: Int)(using Context): Tree =
     367-    val getterPrefix =
     368:      if (meth.is(Synthetic) && meth.name == nme.apply) nme.CONSTRUCTOR else meth.name
     369-    val getterName = DefaultGetterName(getterPrefix, idx)
     370-
     371-    if receiver.isEmpty then
     --
     1154-       * In the meantime, this makes tests pass.
     1155-       */
     1156-      def isInsertedApply = fun1 match
     1157:        case Select(_, nme.apply) => fun1.span.isSynthetic

∴ Thinking…

  Let me search for where a class type is being converted to a new call.

⏺ Search(pattern: "tpd.New|New\\(|class.*appl|isClass.*apply|adapt.*class", path:
        "/Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/typer/Typer.scala", output_mode: "content")
  ⎿  Found 0 lines

∴ Thinking…

  Let me search for constructor and new together to find the creator application logic.

⏺ Search(pattern: "isConstructor|constructorApp|typedApply.*new|inferredNew", path:
        "/Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/typer", output_mode: "content")
  ⎿  Found 20 lines                                                                                                  
     compiler/src/dotty/tools/dotc/typer/Linter.scala:21:      sym.isConstructor ||
     compiler/src/dotty/tools/dotc/typer/Applications.scala:427:         && fn.symbol.isConstructor
     compiler/src/dotty/tools/dotc/typer/Applications.scala:719:      sym.is(JavaDefined) && sym.isConstructor &&
     sym.owner.is(JavaAnnotation)
     compiler/src/dotty/tools/dotc/typer/Applications.scala:726:      ctx.mode.is(Mode.InAnnotation) &&
     sym.isConstructor && sym.owner.isAnnotation
     compiler/src/dotty/tools/dotc/typer/Typer.scala:738:    else if ctx.owner.isConstructor &&
     !ctx.owner.isPrimaryConstructor
     compiler/src/dotty/tools/dotc/typer/Typer.scala:3040:      if !sym.isConstructor then
     compiler/src/dotty/tools/dotc/typer/Typer.scala:3068:    if sym.isConstructor then
     compiler/src/dotty/tools/dotc/typer/Typer.scala:3212:              if ptree.symbol.isConstructor then
     ptree.symbol.owner
     compiler/src/dotty/tools/dotc/typer/Typer.scala:3498:              && !topLevelClassSymbol.info.decls.filter(sym
      => !sym.isConstructor && !sym.is(Synthetic)).isEmpty
     compiler/src/dotty/tools/dotc/typer/Typer.scala:4205:    if ctx.mode.is(Mode.ImplicitsEnabled) &&
     !tree.name.isConstructorName && qual.tpe.isValueType then
     compiler/src/dotty/tools/dotc/typer/Typer.scala:4603:        sym.isConstructor
     compiler/src/dotty/tools/dotc/typer/Typer.scala:4629:         && !tree.symbol.isConstructor
     compiler/src/dotty/tools/dotc/typer/Checking.scala:413:          && !name.isConstructorName
     compiler/src/dotty/tools/dotc/typer/Checking.scala:670:      else if !sym.owner.isClass && !(sym.is(Param) &&
     sym.owner.isConstructor) then fail(em"@publicInBinary cannot be used on local definitions")
     compiler/src/dotty/tools/dotc/typer/Checking.scala:672:      else if sym.is(Private) &&
     !sym.privateWithin.exists && !sym.isConstructor then fail(em"@publicInBinary cannot be used on private
     definitions\n\nConsider using `private[${sym.owner.name}]` or `protected` instead")
     compiler/src/dotty/tools/dotc/typer/Checking.scala:687:    if (sym.isConstructor && !sym.isPrimaryConstructor &&
      sym.owner.is(Trait, butNot = JavaDefined))
     compiler/src/dotty/tools/dotc/typer/Checking.scala:842:      case _: DefDef if stat.symbol.isConstructor =>
     compiler/src/dotty/tools/dotc/typer/RefChecks.scala:62:          if (haveDefaults.exists(x => !x.isConstructor)
     || owners.distinct.size < haveDefaults.size)
     compiler/src/dotty/tools/dotc/typer/RefChecks.scala:1066:       && !sym.isConstructor
     compiler/src/dotty/tools/dotc/typer/RefChecks.scala:1262:        else if sd.owner.isConstructor then s"the
     constructor of `${sd.owner.owner.name.show}`"

∴ Thinking…

  Let me look for where creator applications - calling a class name like a function - get converted to constructor calls.

⏺ Search(pattern: "creator|New\\(.*cls|def typedNew|adapt.*TypeRef", path:
        "/Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/typer", output_mode: "content")
  ⎿  Found 0 lines

∴ Thinking…

  Let me look more specifically at how the apply is handled when a class is called as a function. The issue is when Random
   (a type/class) is called with (null), it creates a constructor call. Let me search for this.

⏺ Search(pattern: "class.*funProto|funProto.*class|adaptToArgs|adapt.*Function", path:
        "/Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/typer/Typer.scala", output_mode: "content")
  ⎿  Found 2 lines                                                        
     4359:    def adaptToArgs(wtp: Type, pt: FunProto): Tree = wtp match {
     5054:              newExpr(tree).orElse(adaptToArgs(wtp, pt))

∴ Thinking…

  Found it! newExpr(tree) is called. Let me look at that.

⏺ Search(pattern: "def newExpr", path: "/Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/typer/Typer.scala",
        output_mode: "content")
  ⎿  Found 20 lines                                                                                      
     4961:    def newExpr(tree: Tree): Tree =
     4962-      val ctorResultType = applyProxyResultType(tree)
     4963-      if !ctorResultType.exists then return EmptyTree
     4964-      val qual = qualifier(tree)
     4965-      val tpt = qual match
     4966-        case Ident(name) =>
     4967-          cpy.Ident(qual)(name.toTypeName)
     4968-        case Select(pre, name) =>
     4969-          cpy.Select(qual)(pre, name.toTypeName)
     4970-        case qual: This if qual.symbol.is(ModuleClass) =>
     4971-          cpy.Ident(qual)(qual.symbol.name.sourceModuleName.toTypeName)
     4972-        case _ =>
     4973-          errorTree(tree, em"cannot convert from $tree to an instance creation expression")
     4974-      val tycon = ctorResultType.underlyingClassRef(refinementOK = Feature.enabled(modularity))
     4975-      typed(
     4976-        untpd.Select(
     4977-          untpd.New(untpd.TypedSplice(tpt.withType(tycon))),
     4978-          nme.CONSTRUCTOR),
     4979-        pt)
     4980-        .showing(i"convert creator $tree -> $result", typr)

∴ Thinking…

  Now I understand the issue. When Random(null) is typed:

  1. Random is first typed as an Ident referencing the import bar.Random
  2. Then newExpr is called to convert it to a constructor call
  3. In newExpr, the code creates untpd.New(untpd.TypedSplice(tpt.withType(tycon))) where tycon = 
  ctorResultType.underlyingClassRef(...)
  4. This creates a new New tree with the class type directly, losing the reference to the original import

  The issue is that the original tree (the Ident "Random" that came from the import) is converted to tpt (line 4967: 
  cpy.Ident(qual)(name.toTypeName)), and then typed with tycon which is scala.util.Random directly.

  The fix needs to ensure that when we do this conversion, we record a usage of the original symbol that was imported.

  Looking at line 4975-4979:
  typed(
    untpd.Select(
      untpd.New(untpd.TypedSplice(tpt.withType(tycon))),
      nme.CONSTRUCTOR),
    pt)

  The tpt is created from qual which is the qualifier of the tree. The problem is that tycon is 
  ctorResultType.underlyingClassRef(...) which resolves to the underlying class, not to the imported alias.

  Let me think about where the fix should be:

  1. In newExpr, we could record a usage of the original tree's symbol before converting
  2. Or we could modify how CheckUnused handles this case

  I think option 1 is cleaner. We need to make sure that when newExpr converts an identifier (that came from an import) to
   a constructor call, we record the usage of that import.

  I see now that CheckUnused operates in a separate phase after typer. The transformed tree it receives is already new 
  scala.util.Random(null), which means it has lost the original reference to the imported Random identifier. 

  Digging into the CheckUnused code, I notice the transformIdent function processes each identifier in the tree. This 
  suggests the transformation happens during the traversal, but the original import context is already lost by this point.

  The critical problem emerges when newExpr conversion replaces the original Ident("Random") with a fully qualified 
  constructor call, effectively erasing the original import's trace.

  Tracing the transformation reveals a nuanced type resolution issue. The process extracts the original identifier, 
  creates a type identifier, and then attempts to construct a new expression. However, the type overwriting step 
  inadvertently severs the connection to the original import context, potentially disrupting symbol resolution and import 
  tracking.

  The key breakdown occurs when .withType(tycon) forcibly replaces the original type information, losing the critical link
   to the source import that established the identifier's scope.

  The AST output confirms this transformation, showing the direct class reference without preserving the original import 
  context. This suggests a fundamental challenge in maintaining type provenance during tree manipulation.

  The core issue stems from type resolution mechanics: while the original identifier points to a local alias, the 
  underlying class reference gets resolved to its canonical type. This means CheckUnused loses track of the specific 
  import path, potentially missing unused import detection.

  A potential solution involves enhancing CheckUnused to track type aliases during new instance creation, ensuring import 
  usage is correctly attributed even when underlying types are resolved to their canonical references.

  The key difference between refUsage and resolveUsage lies in their import handling: one simply records symbol usage, 
  while the other comprehensively checks import contexts and marks relevant imports as used.

  For creator applications like New(TypeTree(scala.util.Random)), the current mechanism fails to track the original import
   source. Two potential solutions emerge: either annotate the tree with import metadata or proactively resolve usage 
  before transformation.

  The core challenge is ensuring that imported symbols are correctly tracked when they're converted from their original 
  identifier form to a new expression, preventing unnecessary unused import warnings.

  The transformation process involves converting Random from a term reference to a type name, which complicates tracking 
  its origin. A targeted modification in the transformTypeTree method could potentially resolve this tracking issue by 
  explicitly resolving symbol usage during type tree transformation.

  The core challenge lies in correctly identifying the import's source when processing type symbols, particularly for 
  New(TypeTree) scenarios where the type symbol exists but its original import context is lost.

  I need to investigate how the tree's metadata captures import information and explore ways to preserve the original 
  import context during type resolution.

  The critical observation is that the import usage tracking fails during type transformation, specifically when Random 
  transitions from an identifier to a fully resolved type tree.

  My focus should be on understanding how CheckUnused traverses the typed tree and determining why it misses the original 
  import reference during this transformation process.

  The code snippet reveals a nuanced type conversion mechanism: when an Ident is encountered, it's converted to a type 
  name while preserving its original source position. This suggests the original reference might still be traceable if the
   right traversal strategy is employed.

  The subsequent type resolution sets the type directly to scala.util.Random, which could potentially obscure the original
   import context from detection mechanisms.

  The core problem emerges in CheckUnused: it fails to recognize the import origin when encountering this transformed type
   tree. The transformation breaks the connection between the original imported type and its usage, leading to unused 
  import detection issues.

  A potential solution involves enhancing type tracking to maintain import lineage, especially for type aliases that get 
  transformed during compilation stages.

  The export mechanism creates a complex type mapping where bar.Random serves as an alias for scala.util.Random, 
  introducing nuanced resolution challenges. When resolving Random(null), the term resolution path becomes intricate, 
  involving both type and term-level transformations that obscure the original import context.

  The core problem centers on tracing the import's origin when constructing a new instance. CheckUnused needs a reliable 
  mechanism to connect the imported symbol with its underlying class type, potentially requiring a deep inspection of 
  import selector semantics and symbol relationships.

  The investigation now focuses on understanding how matchingSelector might provide insights into resolving these 
  intricate type alias scenarios, examining the symbol comparison logic that could help track the import's true source.

  Specifically, the existing infrastructure includes a nuanced check for type aliases, leveraging isAliasType and symbol 
  dealiasing to establish precise type mappings during import resolution.

  The potential gap emerges when type inference interacts with transformTypeTree, potentially bypassing symbol resolution 
  for inferred types. The untpd.TypedSplice wrapping suggests a more complex typing scenario that might require targeted 
  handling.

  I need to investigate how type inference impacts symbol resolution in this transformation context, particularly around 
  inferred type trees and their symbol accessibility.

  The constructor application tracking seems to rely on transformTypeApply, which currently checks constructor symbols but
   might miss nuanced import tracking. A targeted modification could ensure comprehensive symbol usage detection during 
  type resolution.

  I'll investigate how constructor calls are processed through different transformation methods, focusing on the 
  interaction between transformTypeApply and transformSelect to pinpoint where import tracking could be enhanced.

  The key observation is that constructor calls have a specific structural pattern involving New, Select, and Apply, which
   requires careful symbol resolution across multiple transformation stages.

  I need to modify the usage tracking to ensure imports for constructors are properly marked, likely by switching from 
  refUsage to resolveUsage in critical transformation points. The goal is to capture import usage for constructor 
  invocations more comprehensively.

  The implementation will involve strategic modifications in type application and select transformations to correctly 
  handle constructor symbol resolution and import tracking.

  The key challenge involves tracing type aliases and ensuring that imports bringing in types from different packages are 
  correctly recognized during symbol resolution. By leveraging the existing matchingSelector logic, we can potentially 
  resolve type imports more accurately.

  The proposed approach involves examining how constructor calls get transformed and ensuring the resolution mechanism 
  captures the original import context, particularly for type aliases that might reference standard library types.

  The AST reveals that the fully qualified type scala.util.Random is present, which complicates the matching process when 
  attempting to find the original import source. This suggests we need a more nuanced approach to tracking type origins 
  during symbol resolution.

  In the resolveUsage method, the type alias matching logic seems sound - it checks if the alternative symbol is an alias 
  that ultimately points to the same underlying type. However, something is preventing the correct import resolution.

  The key problem likely lies in the transformTypeTree condition, specifically the !tree.isInferred check, which might be 
  inadvertently filtering out this particular type resolution scenario.

  The type tree's creation involves copying an identifier and setting its type, which suggests a synthetic generation 
  process that could be interfering with the inference mechanism. This synthetic creation might be causing unexpected 
  behavior in the type resolution logic.

  When examining the transformation process, I notice the code checks symbol existence and type information carefully. The
   method seems designed to handle different scenarios of identifier resolution, potentially tracking usage and import 
  contexts.

  The current investigation appears focused on understanding how the synthetic type tree is processed and what 
  implications it might have for symbol resolution and type inference.

  I'm exploring whether the type assignment via .withType(tycon) disrupts the original symbol connection, which could 
  impact how unused imports are detected and tracked during compilation.

  The goal seems to be finding a way to preserve more contextual information when creating new type-related trees, 
  potentially by modifying how expressions are constructed or how transformations handle synthetic identifiers.

  The core problem appears to be a timing and transformation issue: the original import reference gets lost during the 
  typing phase, before the CheckUnused phase can analyze it. This means the compiler loses track of the original import 
  context when rewriting trees like Random(null) into fully qualified expressions.

  I need to investigate how to maintain the original import reference through the various compilation stages, potentially 
  by annotating or preserving metadata during tree transformations.

  The transformSelect method suggests an existing mechanism for attaching original names to trees, which could provide a 
  template for solving this specific import tracking challenge. I'll explore how OriginalName is implemented and 
  potentially adapt a similar approach for newExpr transformations.

⏺ Search(pattern: "OriginalName", path: "/Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc", output_mode:
        "content")
  ⎿  Found 4 lines                                                                                              
     compiler/src/dotty/tools/dotc/typer/Typer.scala:53:import transform.CheckUnused.OriginalName
     compiler/src/dotty/tools/dotc/typer/Typer.scala:730:        ref.withAttachment(OriginalName, name)
     compiler/src/dotty/tools/dotc/transform/CheckUnused.scala:76:    val name =
     tree.removeAttachment(OriginalName).getOrElse(nme.NO_NAME)
     compiler/src/dotty/tools/dotc/transform/CheckUnused.scala:500:  val OriginalName = Property.StickyKey[Name]

∴ Thinking…

  Let me look at how OriginalName is used in Typer.scala:

⏺ Read(file_path: "/Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/typer/Typer.scala", offset: 720, limit: 50)
  ⎿  Read 50 lines

∴ Thinking…

  I see - OriginalName is attached when the symbol name is different from the name written by the user (e.g., when 
  importing with renaming).

  Now let me think about the fix. The issue is that when newExpr creates a New tree from an identifier like Random, the 
  original reference to the import is lost.

  Looking at newExpr:
  def newExpr(tree: Tree): Tree =
    val ctorResultType = applyProxyResultType(tree)
    if !ctorResultType.exists then return EmptyTree
    val qual = qualifier(tree)
    val tpt = qual match
      case Ident(name) =>
        cpy.Ident(qual)(name.toTypeName)
      ...
    val tycon = ctorResultType.underlyingClassRef(refinementOK = Feature.enabled(modularity))
    typed(
      untpd.Select(
        untpd.New(untpd.TypedSplice(tpt.withType(tycon))),
        nme.CONSTRUCTOR),
      pt)

  The qual is the qualifier of the tree (e.g., the Random Ident). The type tycon is the underlying class 
  (scala.util.Random).

  When the final New tree is created, it has tpt.withType(tycon) which sets the type to the underlying class directly.

  The issue is that CheckUnused never sees the original Random identifier that was imported. By the time it runs, the tree
   has been transformed to New(scala.util.Random).

  I think the fix should be to call resolveUsage for the original qual before it's transformed. But CheckUnused runs after
   typer, so we can't directly call it from here.

  One approach is to attach information to the tree that CheckUnused can use later. But that seems complicated.

  I'm investigating the typer's transformation process. The original identifier still carries its symbol and type 
  information before adaptation. This suggests there might be a way to preserve the import reference during the 
  transformation.

  The key challenge is intercepting the tree before it loses its original context. I'm exploring potential interception 
  points in the typer's workflow to maintain the connection to the original import.

  Two potential approaches emerge: either preserving import metadata during tree transformation or creating a specialized 
  handling mechanism in the CheckUnused phase. The goal is to track the provenance of imported symbols even after they're 
  transformed into new expressions.

  I'm considering attaching additional metadata to the resulting New tree that can indicate its origin from an imported 
  symbol. This could provide a clean mechanism for tracking the import's usage without disrupting the existing 
  type-checking process.

  The core challenge involves type aliases and how usage tracking occurs across different symbol representations. The 
  matchingSelector function already handles type alias scenarios, which suggests an elegant solution might exist within 
  the existing infrastructure.

  By carefully recording the relationship between the original imported symbol and its dealiased type, we could 
  potentially solve the usage tracking problem without extensive modifications to the compilation pipeline.

  The key insight centers on how prefixes are evaluated during symbol resolution, particularly when NoPrefix is used in 
  type tree transformations. Understanding the nuanced interactions between symbol references and their import contexts 
  seems critical to resolving this detection mechanism.

  I'll trace the symbol resolution path carefully. The current flow involves examining resolveUsage with scala.util.Random
   and tracking how import contexts are processed. The critical observation is how matchingSelector handles different 
  prefix scenarios, especially when no explicit prefix is specified.

  The investigation reveals subtle interactions between symbol names, import selectors, and context traversal that might 
  explain the underlying resolution behavior.

  The method hasAltMember seems key - it checks symbol compatibility by comparing symbols, handling type aliases, and 
  verifying accessibility. For the Random example, multiple conditions must align: symbol matching, alias type 
  recognition, and proper symbol dealiasing.

  I'm noticing potential complexities in how type symbols are compared and resolved across different package contexts. The
   current tracing suggests the resolution mechanism should work theoretically, but something is preventing successful 
  matching.

  The next step involves carefully examining the transformation condition to understand why the expected resolution isn't 
  occurring.

  The TypeTree condition specifically checks whether the tree is not inferred and has an existing symbol. This suggests 
  there might be nuanced type inference behavior affecting the transformation process, particularly around how new 
  expressions are typed and processed.

  The typed method's handling of new tree construction looks intricate, with special processing for different template 
  scenarios. The wrapping of typed trees through TypedSplice introduces potential complexity in type resolution.

  When examining the type processing, the method seems to directly extract the underlying splice for typed splices, which 
  means the original identifier's type gets propagated with the new type constructor applied.

  I'll need to investigate how the identifier transformation specifically handles this type modification, as the current 
  approach might have subtle implications for type inference and symbol resolution.

  The transformation logic appears to involve several key steps around symbol existence and type resolution, which could 
  impact how the identifier's type gets processed during compilation.

  When a symbol exists, the method invokes resolveUsage with the symbol's details, including its name and import prefix. 
  If no symbol is present but a type exists, it still attempts resolution using the type's class symbol and associated 
  details.

  I'll investigate what .withType does to understand how the symbol might be set during this transformation process. The 
  method seems to handle type assignment conditionally, especially when dealing with potential error types.

  The key observation is that .withType sets the type but doesn't modify the underlying symbol. This means the original 
  symbol from qual remains unchanged, which could be problematic when converting a term symbol to a type identifier.

  The critical issue emerges when transforming from a term symbol to a type symbol: the existing symbol might not match 
  the new type context, potentially leading to type resolution complications.

  The test case reveals a nuanced scenario involving exported types and their usage across different packages. The 
  transformation of Random from an exported definition to a type identifier requires careful symbol resolution to ensure 
  type-safe conversion.

  My approach would focus on ensuring resolveUsage correctly handles the symbol transformation during type checking, 
  particularly for exported definitions being used in different type contexts.

  The tree structure shows a complex conversion process: from an initial Ident to a fully resolved New expression with a 
  specific type constructor. The key challenge lies in tracking symbol resolution through these intermediate typing 
  stages, especially when dealing with exported definitions across package boundaries.

  I want to trace how the symbol changes from the original export to the final typed tree, examining the precise mechanism
   of type adaptation and symbol resolution during this transformation.

  The critical observation centers on how .withType interacts with symbol references, potentially revealing a subtle type 
  system inconsistency where term and type symbols might not align correctly during tree reconstruction.

  The potential bug emerges from symbol preservation: when converting an identifier, the original term symbol persists 
  even after type name conversion, which could lead to incorrect type checking or symbol resolution.

  I'm tracking how transformIdent handles symbol resolution, particularly focusing on the nuanced interactions between 
  term and type symbols during transformation.

  The method checks for symbol existence and calls resolveUsage with specific parameters: the symbol, name, and import 
  prefix. In this case, we're examining a scenario involving package-level exports and symbol matching.

  The key complexity lies in verifying whether the imported symbol matches the expected type, considering potential alias 
  types and accessibility constraints. The matchingSelector method performs intricate symbol comparisons, checking not 
  just direct symbol equality but also handling type aliases and accessibility requirements.

  The current investigation focuses on determining if the term export bar.foo$package.Random can be successfully matched 
  within the import context, exploring nuanced type system interactions in Scala's import resolution mechanism.

  Key observations reveal subtle conditions around symbol renaming and prefix matching. The core condition involves 
  checking if the term name exists and matches expected rename criteria, with careful parsing of name comparisons and 
  symbol existence.

  The analysis traces through complex boolean logic, examining how name.exists() evaluates when comparing term names, 
  ultimately revealing that the current condition would pass for the Random term under specific import scenarios.

  The investigation suggests potential deeper complexity around symbol resolution, with hints that the core issue might 
  relate to symbol existence within the abstract syntax tree, particularly for Ident nodes inside New constructs.

  Critically, the analysis uncovers an inconsistent state where an identifier retains a term symbol while transitioning to
   a type name, which could potentially disrupt expected symbol resolution mechanisms.

  The investigation reveals a nuanced transformation where cpy.Ident preserves original symbol characteristics while 
  changing the name, leading to a potentially problematic symbol-type mismatch. The symbol remains anchored to the 
  original term, even after type-related modifications.

  I need to trace how this symbol inconsistency might propagate through the type resolution process, particularly 
  examining how importPrefix behaves with different type representations.

  The key observation centers on the matchingSelector logic, which carefully validates rename conditions and prefix 
  compatibility. Specifically, the checks ensure that:
  - The renamed symbol matches the original term name
  - The prefix aligns with expected package context
  - Alternative member references are considered

  This intricate resolution mechanism suggests a robust approach to handling complex import scenarios, particularly when 
  dealing with package-level symbol transformations.

  The critical bug emerges from mismatched type prefixes: scala.util versus bar.foo$package. This discrepancy prevents 
  recognizing a valid import, erroneously marking it as unused.

  Two potential solutions present themselves:
  1. Omit prefix passing for creator application identifiers
  2. Enhance matchingSelector to handle this specific edge case

  The first approach appears more elegant, avoiding unnecessary complexity in the existing resolution logic.

  Diving deeper into transformIdent, the core issue lies in prefix resolution. Current code retrieves the type's prefix 
  (scala.util) instead of the original import site's prefix (bar.foo$package), leading to incorrect matching.

  A potential remedy involves using tree.symbol.owner.thisType as the prefix when a symbol exists, capturing the symbol's 
  true origin.

  However, further investigation reveals nuanced complexity: the symbol itself is bar.foo$package.Random, suggesting the 
  solution requires more careful consideration.

  By examining the prefix details - bar.foo$package.type as the computed prefix, and verifying type equivalence through 
  qtpe =:= prefix - a targeted fix emerges for type position prefix computation in the transformation process.

  The code explores resolving symbol references, particularly for synthetic and inline contexts, by recursively traversing
   prefixes up to a depth of 10. This approach ensures comprehensive symbol resolution while preventing excessive 
  recursion.

  The method carefully handles different code generation scenarios, distinguishing between user code, synthetic positions,
   and inline expansions to determine the appropriate resolution context.

  A key observation emerges about potential mismatches between type prefixes and import sites, especially for exports and 
  type aliases, suggesting the resolution logic might need refinement in the matchingSelector method.

  The current prefix validation seems too restrictive, potentially breaking scenarios where symbol resolution doesn't 
  perfectly align with type prefixes. Specifically, the condition checking qtpe =:= prefix could prevent legitimate 
  import/export scenarios from resolving correctly.

  I'm considering a more flexible approach that would allow prefix matching to be relaxed when dealing with type aliases 
  or export constructs, potentially by introducing a conditional check that accounts for these special import scenarios.

  The underlying challenge involves ensuring symbol resolution remains accurate while accommodating the nuanced type 
  system behaviors in Scala's import mechanisms. I see the complexity around symbol matching for exports. The key insight 
  is that the export generates both a type alias and a term, and the current prefix check prevents proper resolution. The 
  proposed solution involves modifying the prefix validation to consider the symbol's owner context, which would allow 
  more flexible matching when dealing with exported definitions. This approach aims to handle cases where the symbol 
  originates from the import site, potentially bypassing strict prefix requirements.

  The modification would involve adding a condition that checks the symbol's owner relationship to the import site, 
  creating a more nuanced resolution mechanism for exported members. By relaxing the prefix constraint, we can better 
  support complex module and export scenarios in Scala's type system. I see the complexity around symbol resolution and 
  import prefixes. The proposed modification aims to handle export scenarios more accurately by checking symbol ownership 
  and type compatibility. The key is relaxing prefix checks when the symbol originates from the import site, ensuring 
  proper type matching across different scoping contexts.

  The code explores nuanced conditions for determining symbol accessibility, particularly focusing on how symbols from 
  package objects and exported symbols are resolved during type checking and import selection.

  By adding sym.exists and carefully comparing type prefixes, the implementation provides more robust handling of symbol 
  references across different compilation units and package structures.

  The export definition's package object context and import site type alignment suggest a precise matching strategy that 
  accounts for potential symbol variations. This approach ensures accurate resolution of symbol usages by checking 
  ownership and type compatibility.

  The proposed modification addresses edge cases where symbol resolution might previously have been incomplete or 
  ambiguous.

⏺ Let me understand the issue better by looking at what tree CheckUnused sees:  01:02 AM  claude-opus-4-5-20251101

⏺ Bash(JAVA_HOME=/Users/lihaoyi/Library/Caches/Coursier/arc/https/cdn.azul.com/zulu/bin/zulu17.62.17-ca-jdk17 timeout: 5m 
      .0.17-macosx_aarch64.tar.gz/zulu17.62.17-ca-jdk17.0.17-macosx_aarch64/ bin/scalac -Xprint:typer         0s
      -Yplain-printer foo.scala 2>&1 | head -40)
  ⎿  Option -Xprint is a deprecated alias: use -Vprint instead                       
     [[syntax trees at end of                     typer]] // foo.scala
     PackageDef(Ident(<empty>), List(
       PackageDef(Ident(bar), List(
         ValDef(foo$package, Ident(foo$package$),
           Apply(Select(New(Ident(foo$package$)), <init>), List())),
         TypeDef(foo$package$,
           Template(DefDef(<init>, List(List()), TypeTree(), Thicket(List())),
             List(Apply(Select(New(TypeTree()), <init>), List())),
             ValDef(_, SingletonTypeTree(Ident(foo$package)), Thicket(List())), List(
             Export(Select(Ident(scala), util), List(
               ImportSelector(Ident(Random), Thicket(List()), Thicket(List())))),
             DefDef(Random, List(), TypeTree(),
               Select(Select(Ident(scala), util), Random)),
             TypeDef(Random, TypeTree())))
         )
       )),
       PackageDef(Ident(foo), List(
         Import(Ident(bar), List(
           ImportSelector(Ident(Random), Thicket(List()), Thicket(List())))),
         ValDef(foo$package, Ident(foo$package$),
           Apply(Select(New(Ident(foo$package$)), <init>), List())),
         TypeDef(foo$package$,
           Template(DefDef(<init>, List(List()), TypeTree(), Thicket(List())),
             List(Apply(Select(New(TypeTree()), <init>), List())),
             ValDef(_, SingletonTypeTree(Ident(foo$package)), Thicket(List())), List(
             DefDef(main, List(List()), TypeTree(),
               Block(List(),
                 Apply(Ident(println), List(
                   Apply(Select(New(Ident(Random)), <init>), List(Literal(null)))))
               )
             )
           ))
         )
       ))
     ))

     1 warning found

∴ Thinking…

  I can see it now! The tree has:
  Apply(Select(New(Ident(Random)), <init>), List(Literal(null)))

  So there IS an Ident(Random) inside the New. This means transformIdent should be called on it. Let me trace through what
   happens...

  The Ident(Random) inside New should be processed by transformIdent. Let me check what values it would have:
  - tree.name is Random
  - tree.symbol is... ?
  - tree.tpe is scala.util.Random

  The symbol should be the type alias from the export, or maybe the class directly. Let me check...

  Actually, from the output, I see the AST has Ident(Random) but what's its type and symbol? The output shows 
  New(Ident(Random)) not New(Ident(scala.util.Random)), so it seems the identifier retains the name Random.

  But the warning says "unused import", which means the import isn't being matched. Let me trace through resolveUsage more
   carefully.

  In transformIdent:
  if tree.symbol.exists then
    resolveUsage(tree.symbol, tree.name, tree.typeOpt.importPrefix.skipPackageObject, imports = resolving)
  else if tree.hasType then
    resolveUsage(tree.tpe.classSymbol, tree.name, tree.tpe.importPrefix.skipPackageObject)

  If tree.symbol doesn't exist (maybe because it's a type-only reference), then it uses tree.tpe.classSymbol which would 
  be scala.util.Random.

  Let me check the prefix. tree.tpe.importPrefix for scala.util.Random would be scala.util.

  In matchingSelector, the condition for named imports:

  && (prefix.eq(NoPrefix) || qtpe =:= prefix)

  I see the problem now. The prefix comparison prevents the import from matching. When checking named imports, the current
   logic requires an exact prefix match, which fails in this case. This means type aliases or imported types with 
  different package contexts won't be recognized correctly.

  The solution needs to modify the matching logic to be more flexible, especially for type aliases and imported types with
   complex package structures.

⏺ Now I understand the issue. Looking at the tree: New(Ident(Random)) - the     01:03 AM  claude-opus-4-5-20251101
  Ident retains the name Random but its type is scala.util.Random. The problem
  is in matchingSelector in CheckUnused.

  Let me trace through the logic:
  1. transformIdent is called on Ident(Random) inside New
  2. It calls resolveUsage(tree.tpe.classSymbol, tree.name, 
  tree.tpe.importPrefix.skipPackageObject)
  3. This is resolveUsage(scala.util.Random, Random, scala.util)
  4. In matchingSelector, the prefix check (prefix.eq(NoPrefix) || qtpe =:= 
  prefix) fails because:
    - prefix is scala.util (from the type)
    - qtpe is bar.foo$package.type (import site)
    - These don't match!

  The fix should relax the prefix check when the import site contains a type
  alias that resolves to the target type.

∴ Thinking…

  Let me look at the exact code in matchingSelector and implement the fix:

⏺ Read(file_path: "/Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala", offset: 346,
      limit: 50)
  ⎿  Read 50 lines

∴ Thinking…

  I see the issue now. Line 382 has the condition:
  && (prefix.eq(NoPrefix) || qtpe =:= prefix)

  This requires that either:1. The prefix is NoPrefix (no prefix specified)
  2. The import site type equals the prefix

  But in our case:- prefix is scala.util (from scala.util.Random)- qtpe is bar.foo$package.type (import site)

  These don't match!The fix should also check if hasAltMember returns true even when the prefixes don't match - i.e., when
   there's a type alias at the import site that points to the target.But actually, looking at the condition more 
  carefully:```scala
       !name.exists(_.toTermName != sel.rename) // if there is an explicit name, it must match
    && (prefix.eq(NoPrefix) || qtpe =:= prefix)
    && (hasAltMember(sel.name) || hasAltMember(sel.name.toTypeName))

  The `hasAltMember` check happens after the prefix check. So even if `hasAltMember` would find the alias, the prefix 
  check fails first.

  The fix should be to make the prefix check less strict when there's a type alias. One approach is to check if 
  `hasAltMember` would succeed and use that to relax the prefix check.Actually, I think the cleanest fix is to move the 
  prefix check into `hasAltMember` or add a parallel check that handles aliases.

  Let me think about this more carefully. The purpose of the prefix check `qtpe =:= prefix` is to ensure we're importing 
  from the right location. For example, if we have:
  ```scala
  import foo.X
  import bar.X // different Xval x: foo.X // uses foo.X, not bar.X
  ```We want to mark only the `import foo.X` as used, not `import bar.X`.But for exports/type aliases, the actual class 
  location might be different:```scala


  package bar { export scala.util.Random }
  import bar.Random // imports alias to scala.util.Random
  val x: Random // type is scala.util.Random

  I realize we need a more nuanced approach to handle type aliases. The key is to recognize when an import resolves to the
   target type through an alias, even if the prefixes don't directly match. This means checking if the import site has a 
  type alias that ultimately points to the intended type, regardless of the original prefix.

  The solution involves modifying the prefix matching logic to be more flexible. We want to allow imports that resolve to 
  the correct type through an alias, ensuring we correctly track usage across different package structures.

  By introducing a specific check for type aliases that can trace back to the original type, we create a more robust 
  mechanism for import resolution and usage tracking.

  The core challenge involves relaxing prefix constraints while maintaining precise type alias identification. I'll modify
   the approach to handle type alias scenarios more flexibly, allowing imports that resolve correctly even when the direct
   prefix match fails.

  The key insight is creating a targeted method that specifically validates type alias relationships, enabling more 
  nuanced import matching without compromising type safety.

  By adjusting the condition sequence and introducing a specialized type alias resolution check, we can create a more 
  adaptive import validation mechanism that accommodates complex type alias scenarios.

  The proposed solution involves restructuring the import validation logic to prioritize type alias resolution over strict
   prefix matching, ensuring more robust and flexible type importing.

  The key modification relaxes prefix constraints when a type alias matching the target symbol is detected, allowing more 
  nuanced type selection during import resolution.

  I'll define a helper method hasAltTypeAlias that checks for type aliases with specific accessibility and symbol matching
   criteria. This approach simplifies the complex conditional logic by extracting the type alias verification into a 
  dedicated function.

  The new implementation introduces a cleaner, more modular check that verifies type alias exports while maintaining the 
  existing rename and prefix validation rules.

  I'll focus on three key validation steps: name matching, member existence, and prefix compatibility, with special 
  handling for type aliases to provide more flexible symbol resolution.

⏺ Now I'll implement the fix. The issue is on line 382 - the prefix check       01:04 AM  claude-opus-4-5-20251101
  (prefix.eq(NoPrefix) || qtpe =:= prefix) fails for exports because the import
   site (bar.foo$package) differs from the type's prefix (scala.util).

  The fix is to also allow the import to match when there's a type alias at the
   import site that resolves to the target symbol:

⏺ Update(/Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala)
  ⎿  Updated /Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala with 1 addition  
     and 1 removal
       379                  false
       380                else
       381                     !name.exists(_.toTermName != sel.rename) // if there is an explicit name, it must 
             match
       382 -                && (prefix.eq(NoPrefix) || qtpe =:= prefix)
       382                  && (hasAltMember(sel.name) || hasAltMember(sel.name.toTypeName))
       383 +                && (prefix.eq(NoPrefix) || qtpe =:= prefix || hasTypeAlias(sel.name.toTypeName))
       384              if matches then sel else loop(sels)
       385            case nil => null
       386          loop(info.selectors)

∴ Thinking…

  Now I need to define the hasTypeAlias helper function. I'll add it near the other helper functions in matchingSelector:

⏺ Now I need to add the hasTypeAlias helper function:                           01:04 AM  claude-opus-4-5-20251101

⏺ Update(/Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala)
  ⎿  Updated /Users/lihaoyi/Github/scala3/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala with 2 additions
       351              || nm.isTypeName && alt.symbol.isAliasType && alt.info.dealias.typeSymbol == sym
       352            sameSym && alt.symbol.isAccessibleFrom(qtpe)
       353          def hasAltMemberNamed(nm: Name) = qtpe.member(nm).hasAltWith(_.symbol.isAccessibleFrom(qtpe))
       354 +        def hasTypeAlias(nm: Name) = nm.isTypeName && qtpe.member(nm).hasAltWith: alt =>
       355 +          alt.symbol.isAliasType && alt.info.dealias.typeSymbol == sym && 
           + alt.symbol.isAccessibleFrom(qtpe)
       356    
       357          def loop(sels: List[ImportSelector]): ImportSelector | Null = sels match
       358            case sel :: sels =>

∴ Thinking…

  Good, now let me test the fix:

⏺ Now let's test the fix:                                                       01:05 AM  claude-opus-4-5-20251101

⏺ Bash(JAVA_HOME=/Users/lihaoyi/Library/Caches/Coursier/arc/https/cdn.azul.com/zulu/bin/zulu17.62.17-ca-jdk17 timeout: 5m 
      .0.17-macosx_aarch64.tar.gz/zulu17.62.17-ca-jdk17.0.17-macosx_aarch64/ bin/scalac -Wunused:all          0s
      foo.scala 2>&1)
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    [success] Total time: 140 s (0:02:20.0), completed 28 Nov 2025, 1:08:01 am

∴ Thinking…

  The fix compiled successfully and no warning was produced for foo.scala! The unused import warning is now gone. Let me 
  update the todo list and run a few more tests to make sure the fix works correctly and doesn't break anything:1. The 
  basic test case passes
  2. I should check that actually unused imports are still flagged
  3. I should verify the existing test suite still passes

⏺ The fix works - no warning is produced now. Let me update the todo list and   01:08 AM  claude-opus-4-5-20251101
  verify the fix doesn't break other cases:

∴ Thinking…

  Let me test that unused imports are still properly flagged:

⏺ Bash(cat > /tmp/unused_test.scala << 'EOF'                                                                  timeout: 1m 
      package bar {                                                                                           0s
        export scala.util.Random
      }
      package foo {
        import bar.Random  // This should still be flagged as unused since it's not used!
        def main() = {
          println("hello")
        }
      }
      EOF
      JAVA_HOME=/Users/lihaoyi/Library/Caches/Coursier/arc/https/cdn.azul.com/zulu/bin/zulu17.62.17-ca-jdk17.
      0.17-macosx_aarch64.tar.gz/zulu17.62.17-ca-jdk17.0.17-macosx_aarch64/ bin/scalac -Wunused:all
      /tmp/unused_test.scala 2>&1 | tail -10)
  ⎿  -- [E198] Unused Symbol Warning: /tmp/unused_test.scala:5:13 -------------------      
     5 |  import bar.Random  // This should still be flagged as unused since it's not used!
       |             ^^^^^^
       |             unused import
     1 warning found

∴ Thinking…

  Unused imports are still correctly flagged. Now let me also test another edge case - what if we have both used and 
  unused imports:

⏺ Unused imports are still correctly flagged. Let me also test that the fix     01:09 AM  claude-opus-4-5-20251101
  works for the type annotation case mentioned in the original issue:

⏺ Bash(cat > /tmp/type_test.scala << 'EOF'                                                                    timeout: 1m 
      package bar {                                                                                           0s
        export scala.util.Random
      }
      package foo {
        import bar.Random
        def main() = {
          println(null: Random)  // Using Random as type annotation
        }
      }
      EOF
      JAVA_HOME=/Users/lihaoyi/Library/Caches/Coursier/arc/https/cdn.azul.com/zulu/bin/zulu17.62.17-ca-jdk17.
      0.17-macosx_aarch64.tar.gz/zulu17.62.17-ca-jdk17.0.17-macosx_aarch64/ bin/scalac -Wunused:all
      /tmp/type_test.scala 2>&1 | tail -10)
  ⎿  (No content)

∴ Thinking…

  The type annotation case also works. Now let me run the existing test suite for CheckUnused to make sure we haven't 
  broken anything:

⏺ Excellent! Both the creator application and type annotation cases work

[som-snytt]

Amazing! I wonder if chatgpt would summarize for me. I think somewhere in the middle might be my suggestion to add an attachment to preserve the original, similar to what happens when an imported name is changed. My WIP tries to not munge the tree.

If that approach doesn't work out, then eliminating false positives is OK, even at the cost of introducing false negatives. Is it likely to see imports of both a definition and its export?