Fix parsing errors using anonymous records and units of measures

docs/release-notes/.FSharp.Compiler.Service/10.0.100.md

@@ -1,4 +1,6 @@
 ### Fixed
+
+* Fix parsing errors using anonymous records and units of measures ([PR #18543](https://github.com/dotnet/fsharp/pull/18543))
 * Fixed: Allow `return`, `return!`, `yield`, `yield!` type annotations without parentheses ([PR #18533](https://github.com/dotnet/fsharp/pull/18533))
 * Allow `let!` and `use!` type annotations without requiring parentheses ([PR #18508](https://github.com/dotnet/fsharp/pull/18508))
 * Fix find all references for F# exceptions ([PR #18565](https://github.com/dotnet/fsharp/pull/18565))

docs/release-notes/.FSharp.Compiler.Service/9.0.300.md

@@ -30,6 +30,7 @@
 * Make `[<CallerMemberName; Struct>]` combination work([PR #18444](https://github.com/dotnet/fsharp/pull/18444/))
 * Fix code completion considers types from own namespace non-imported ([PR #18518](https://github.com/dotnet/fsharp/issues/18518))
 * Code completion: fix getting qualifier expression in do statements in type decls ([PR #18524](https://github.com/dotnet/fsharp/pull/18524))
+* Fix parsing errors using anonymous records and units of measures ([PR #18543](https://github.com/dotnet/fsharp/pull/18543))
 * Fixed: [#18441](https://github.com/dotnet/fsharp/issues/18441) FSI multi-emit unstable. ([PR #18465](https://github.com/dotnet/fsharp/pull/18465))
 * Fixed: Allow `return`, `return!`, `yield`, `yield!` type annotations without parentheses ([PR #18533](https://github.com/dotnet/fsharp/pull/18533))
 

docs/release-notes/.Language/preview.md

@@ -6,6 +6,7 @@
 * Support ValueOption + Struct attribute as optional parameter for methods ([Language suggestion #1136](https://github.com/fsharp/fslang-suggestions/issues/1136), [PR #18098](https://github.com/dotnet/fsharp/pull/18098))
 * Allow `_` in `use!` bindings values (lift FS1228 restriction) ([PR #18487](https://github.com/dotnet/fsharp/pull/18487))
 * Warn when `unit` is passed to an `obj`-typed argument  ([PR #18330](https://github.com/dotnet/fsharp/pull/18330))
+* Fix parsing errors using anonymous records and units of measures ([PR #18543](https://github.com/dotnet/fsharp/pull/18543))
 * Scoped Nowarn: added the #warnon compiler directive ([Language suggestion #278](https://github.com/fsharp/fslang-suggestions/issues/278), [RFC FS-1146 PR](https://github.com/fsharp/fslang-design/pull/782), [PR #18049](https://github.com/dotnet/fsharp/pull/18049))
 * Allow `let!` and `use!` type annotations without requiring parentheses. ([PR #18508](https://github.com/dotnet/fsharp/pull/18508))
 

src/Compiler/Driver/CompilerDiagnostics.fs

@@ -1141,6 +1141,7 @@ type Exception with
                 | Parser.TOKEN_COLON_EQUALS -> SR.GetString("Parser.TOKEN.COLON.EQUALS")
                 | Parser.TOKEN_LARROW -> SR.GetString("Parser.TOKEN.LARROW")
                 | Parser.TOKEN_EQUALS -> SR.GetString("Parser.TOKEN.EQUALS")
+                | Parser.TOKEN_GREATER_BAR_RBRACE -> SR.GetString("Parser.TOKEN.GREATER.BAR.RBRACE")
                 | Parser.TOKEN_GREATER_BAR_RBRACK -> SR.GetString("Parser.TOKEN.GREATER.BAR.RBRACK")
                 | Parser.TOKEN_MINUS -> SR.GetString("Parser.TOKEN.MINUS")
                 | Parser.TOKEN_ADJACENT_PREFIX_OP -> SR.GetString("Parser.TOKEN.ADJACENT.PREFIX.OP")

src/Compiler/FSComp.txt

@@ -1799,6 +1799,7 @@ featureDeprecatePlacesWhereSeqCanBeOmitted,"Deprecate places where 'seq' can be
 featureSupportValueOptionsAsOptionalParameters,"Support ValueOption as valid type for optional member parameters"
 featureSupportWarnWhenUnitPassedToObjArg,"Warn when unit is passed to a member accepting `obj` argument, e.g. `Method(o:obj)` will warn if called via `Method()`."
 featureUseBangBindingValueDiscard,"Allows use! _ = ... in computation expressions"
+featureBetterAnonymousRecordParsing,"Support for better anonymous record parsing"
 featureScopedNowarn,"Support for scoped enabling / disabling of warnings by #warn and #nowarn directives, also inside modules"
 featureAllowLetOrUseBangTypeAnnotationWithoutParens,"Allow let! and use! type annotations without requiring parentheses"
 3874,lexWarnDirectiveMustBeFirst,"#nowarn/#warnon directives must appear as the first non-whitespace characters on a line"

src/Compiler/FSStrings.resx

@@ -357,6 +357,9 @@
   <data name="Parser.TOKEN.EQUALS" xml:space="preserve">
     <value>symbol '='</value>
   </data>
+  <data name="Parser.TOKEN.GREATER.BAR.RBRACE" xml:space="preserve">
+    <value>symbol '&gt;|}'</value>
+  </data>  
   <data name="Parser.TOKEN.GREATER.BAR.RBRACK" xml:space="preserve">
     <value>symbol '&gt;|]'</value>
   </data>

src/Compiler/Facilities/LanguageFeatures.fs

@@ -100,6 +100,7 @@ type LanguageFeature =
     | SupportValueOptionsAsOptionalParameters
     | WarnWhenUnitPassedToObjArg
     | UseBangBindingValueDiscard
+    | BetterAnonymousRecordParsing
     | ScopedNowarn
     | AllowTypedLetOrUseBang
 
@@ -233,6 +234,7 @@ type LanguageVersion(versionText) =
                 LanguageFeature.SupportValueOptionsAsOptionalParameters, previewVersion
                 LanguageFeature.WarnWhenUnitPassedToObjArg, previewVersion
                 LanguageFeature.UseBangBindingValueDiscard, previewVersion
+                LanguageFeature.BetterAnonymousRecordParsing, previewVersion
                 LanguageFeature.ScopedNowarn, previewVersion
                 LanguageFeature.AllowTypedLetOrUseBang, previewVersion
             ]
@@ -398,6 +400,7 @@ type LanguageVersion(versionText) =
         | LanguageFeature.SupportValueOptionsAsOptionalParameters -> FSComp.SR.featureSupportValueOptionsAsOptionalParameters ()
         | LanguageFeature.WarnWhenUnitPassedToObjArg -> FSComp.SR.featureSupportWarnWhenUnitPassedToObjArg ()
         | LanguageFeature.UseBangBindingValueDiscard -> FSComp.SR.featureUseBangBindingValueDiscard ()
+        | LanguageFeature.BetterAnonymousRecordParsing -> FSComp.SR.featureBetterAnonymousRecordParsing ()
         | LanguageFeature.ScopedNowarn -> FSComp.SR.featureScopedNowarn ()
         | LanguageFeature.AllowTypedLetOrUseBang -> FSComp.SR.featureAllowLetOrUseBangTypeAnnotationWithoutParens ()
 

src/Compiler/Facilities/LanguageFeatures.fsi

@@ -91,6 +91,7 @@ type LanguageFeature =
     | SupportValueOptionsAsOptionalParameters
     | WarnWhenUnitPassedToObjArg
     | UseBangBindingValueDiscard
+    | BetterAnonymousRecordParsing
     | ScopedNowarn
     | AllowTypedLetOrUseBang
 

src/Compiler/Service/ServiceLexing.fs

@@ -283,6 +283,7 @@ module internal TokenClassifications =
         | LBRACE_BAR -> (FSharpTokenColorKind.Punctuation, FSharpTokenCharKind.Delimiter, FSharpTokenTriggerClass.MatchBraces)
 
         | GREATER_RBRACK
+        | GREATER_BAR_RBRACE
         | GREATER_BAR_RBRACK -> (FSharpTokenColorKind.Punctuation, FSharpTokenCharKind.Delimiter, FSharpTokenTriggerClass.None)
 
         | RQUOTE _
@@ -1387,6 +1388,7 @@ type FSharpTokenKind =
     | Comma
     | RightArrow
     | GreaterBarRightBracket
+    | GreaterBarRightBrace
     | LeftParenthesisStarRightParenthesis
     | Open
     | Or
@@ -1598,6 +1600,7 @@ type FSharpToken =
         | STAR -> FSharpTokenKind.Star
         | COMMA -> FSharpTokenKind.Comma
         | RARROW -> FSharpTokenKind.RightArrow
+        | GREATER_BAR_RBRACE -> FSharpTokenKind.GreaterBarRightBrace
         | GREATER_BAR_RBRACK -> FSharpTokenKind.GreaterBarRightBracket
         | LPAREN_STAR_RPAREN -> FSharpTokenKind.LeftParenthesisStarRightParenthesis
         | OPEN -> FSharpTokenKind.Open

src/Compiler/Service/ServiceLexing.fsi

@@ -457,6 +457,7 @@ type public FSharpTokenKind =
     | Comma
     | RightArrow
     | GreaterBarRightBracket
+    | GreaterBarRightBrace
     | LeftParenthesisStarRightParenthesis
     | Open
     | Or

src/Compiler/SyntaxTree/LexFilter.fs

@@ -1093,7 +1093,7 @@ type LexFilterImpl (
                             scanAhead nParen
                         else
                             false
-                    | GREATER _ | GREATER_RBRACK | GREATER_BAR_RBRACK ->
+                    | GREATER _ | GREATER_RBRACK | GREATER_BAR_RBRACK | GREATER_BAR_RBRACE ->
                         let nParen = nParen - 1
                         let hasAfterOp = (match lookaheadToken with GREATER _ -> false | _ -> true)
                         if nParen > 0 then
@@ -1201,6 +1201,11 @@ type LexFilterImpl (
                             delayToken (pool.UseShiftedLocation(tokenTup, INFIX_AT_HAT_OP "@", 1, 0))
                             delayToken (pool.UseShiftedLocation(tokenTup, LESS res, 0, -1))
                             pool.Return tokenTup
+                        | GREATER_BAR_RBRACE ->
+                            lexbuf.CheckLanguageFeatureAndRecover LanguageFeature.BetterAnonymousRecordParsing lexbuf.LexemeRange
+                            delayToken (pool.UseShiftedLocation(tokenTup, BAR_RBRACE, 1, 0))
+                            delayToken (pool.UseShiftedLocation(tokenTup, GREATER res, 0, -2))
+                            pool.Return tokenTup
                         | GREATER_BAR_RBRACK ->
                             delayToken (pool.UseShiftedLocation(tokenTup, BAR_RBRACK, 1, 0))
                             delayToken (pool.UseShiftedLocation(tokenTup, GREATER res, 0, -2))

src/Compiler/lex.fsl

@@ -905,6 +905,8 @@ rule token (args: LexArgs) (skip: bool) = parse
 
  | ">" { GREATER false }
 
+ | ">|}" { GREATER_BAR_RBRACE }
+
  | "[<" { LBRACK_LESS }
 
  | "]" { RBRACK }

src/Compiler/pars.fsy

@@ -84,7 +84,7 @@ let parse_error_rich = Some(fun (ctxt: ParseErrorContext<_>) ->
 %token EXCEPTION FALSE FOR FUN FUNCTION IF IN JOIN_IN FINALLY DO_BANG
 %token LAZY OLAZY MATCH MATCH_BANG MUTABLE NEW OF
 %token OPEN OR REC THEN TO TRUE TRY TYPE VAL INLINE INTERFACE INSTANCE CONST
-%token WHEN WHILE WHILE_BANG WITH HASH AMP AMP_AMP QUOTE LPAREN RPAREN RPAREN_COMING_SOON RPAREN_IS_HERE STAR COMMA RARROW GREATER_BAR_RBRACK LPAREN_STAR_RPAREN
+%token WHEN WHILE WHILE_BANG WITH HASH AMP AMP_AMP QUOTE LPAREN RPAREN RPAREN_COMING_SOON RPAREN_IS_HERE STAR COMMA RARROW GREATER_BAR_RBRACK GREATER_BAR_RBRACE LPAREN_STAR_RPAREN
 %token QMARK QMARK_QMARK DOT COLON COLON_COLON COLON_GREATER COLON_QMARK_GREATER COLON_QMARK COLON_EQUALS SEMICOLON
 %token SEMICOLON_SEMICOLON LARROW EQUALS LBRACK LBRACK_BAR LBRACE_BAR LBRACK_LESS
 %token BAR_RBRACK BAR_RBRACE UNDERSCORE