ICE: expr in place where literal is expected (builtin attr parsing)

[matthiaskrgr]

auto-reduced (treereduce-rust):

//@compile-flags: --crate-type=lib
#[crate_name = concat!("Cloneb")]

macro_rules! inline {
    () => {};
}

original:

#[crate_name = concat!("Cloneb")]
macro_rules! mac {
    ($ident:ident) => { let $ident = 42; }
}

#[macro_export]
macro_rules! inline {
    () => ()
}

Version information

rustc 1.87.0-nightly (ac91805f3 2025-02-26)
binary: rustc
commit-hash: ac91805f3179fc2225c60e8ccf5a1daa09d43f3d
commit-date: 2025-02-26
host: x86_64-unknown-linux-gnu
release: 1.87.0-nightly
LLVM version: 20.1.0

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc --crate-type=lib

Program output

warning: unused macro definition: `inline`
 --> /tmp/icemaker_global_tempdir.o4pBxOKZHwPg/rustc_testrunner_tmpdir_reporting.DGIJGRHWWShI/mvce.rs:3:14
  |
3 | macro_rules! inline {
  |              ^^^^^^
  |
  = note: `#[warn(unused_macros)]` on by default

warning: crate-level attribute should be an inner attribute: add an exclamation mark: `#![foo]`
 --> /tmp/icemaker_global_tempdir.o4pBxOKZHwPg/rustc_testrunner_tmpdir_reporting.DGIJGRHWWShI/mvce.rs:1:1
  |
1 | #[crate_name = concat!("Cloneb")]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(unused_attributes)]` on by default

warning: 2 warnings emitted

note: no errors encountered even though delayed bugs were created

note: those delayed bugs will now be shown as internal compiler errors

error: internal compiler error: expr in place where literal is expected (builtin attr parsing)
 --> /tmp/icemaker_global_tempdir.o4pBxOKZHwPg/rustc_testrunner_tmpdir_reporting.DGIJGRHWWShI/mvce.rs:1:14
  |
1 | #[crate_name = concat!("Cloneb")]
  |              ^
  |
note: delayed at compiler/rustc_attr_parsing/src/parser.rs:359:24
         0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
         1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
         2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
         3: <rustc_errors::DiagCtxtHandle>::span_delayed_bug::<rustc_span::span_encoding::Span, &str>
         4: <rustc_attr_parsing::parser::MetaItemParser>::from_attr
         5: <rustc_resolve::def_collector::DefCollector as rustc_ast::visit::Visitor>::visit_item
         6: <rustc_resolve::def_collector::DefCollector as rustc_ast::visit::Visitor>::visit_crate
         7: <rustc_resolve::Resolver as rustc_expand::base::ResolverExpand>::visit_ast_fragment_with_placeholders
         8: <rustc_expand::expand::MacroExpander>::collect_invocations
         9: <rustc_expand::expand::MacroExpander>::fully_expand_fragment
        10: <rustc_expand::expand::MacroExpander>::expand_crate
        11: rustc_interface::passes::resolver_for_lowering_raw
        12: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::resolver_for_lowering_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 16]>>
        13: <rustc_query_impl::query_impl::resolver_for_lowering_raw::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, ())>>::call_once
        14: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 16]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        15: rustc_query_impl::query_impl::resolver_for_lowering_raw::get_query_non_incr::__rust_end_short_backtrace
        16: rustc_interface::passes::create_and_enter_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
        17: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
        18: std::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
        19: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
        20: std::sys::pal::unix::thread::Thread::new::thread_start
        21: <unknown>
        22: <unknown>
 --> /tmp/icemaker_global_tempdir.o4pBxOKZHwPg/rustc_testrunner_tmpdir_reporting.DGIJGRHWWShI/mvce.rs:1:14
  |
1 | #[crate_name = concat!("Cloneb")]
  |              ^

error: internal compiler error: expr in place where literal is expected (builtin attr parsing)
 --> /tmp/icemaker_global_tempdir.o4pBxOKZHwPg/rustc_testrunner_tmpdir_reporting.DGIJGRHWWShI/mvce.rs:1:1
  |
1 | #[crate_name = concat!("Cloneb")]
  | ^^^^^^^^^^^^^^
  |
note: delayed at /rustc/ac91805f3179fc2225c60e8ccf5a1daa09d43f3d/compiler/rustc_attr_parsing/src/context.rs:336:43
         0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
         1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
         2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
         3: <rustc_errors::DiagCtxtHandle>::span_delayed_bug::<rustc_span::span_encoding::Span, &str>
         4: <rustc_resolve::def_collector::DefCollector as rustc_ast::visit::Visitor>::visit_item
         5: <rustc_resolve::def_collector::DefCollector as rustc_ast::visit::Visitor>::visit_crate
         6: <rustc_resolve::Resolver as rustc_expand::base::ResolverExpand>::visit_ast_fragment_with_placeholders
         7: <rustc_expand::expand::MacroExpander>::collect_invocations
         8: <rustc_expand::expand::MacroExpander>::fully_expand_fragment
         9: <rustc_expand::expand::MacroExpander>::expand_crate
        10: rustc_interface::passes::resolver_for_lowering_raw
        11: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::resolver_for_lowering_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 16]>>
        12: <rustc_query_impl::query_impl::resolver_for_lowering_raw::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, ())>>::call_once
        13: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 16]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
        14: rustc_query_impl::query_impl::resolver_for_lowering_raw::get_query_non_incr::__rust_end_short_backtrace
        15: rustc_interface::passes::create_and_enter_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
        16: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
        17: std::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
        18: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
        19: std::sys::pal::unix::thread::Thread::new::thread_start
        20: <unknown>
        21: <unknown>
 --> /tmp/icemaker_global_tempdir.o4pBxOKZHwPg/rustc_testrunner_tmpdir_reporting.DGIJGRHWWShI/mvce.rs:1:1
  |
1 | #[crate_name = concat!("Cloneb")]
  | ^^^^^^^^^^^^^^

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: please make sure that you have updated to the latest nightly

note: rustc 1.87.0-nightly (ac91805f3 2025-02-26) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib -Z dump-mir-dir=dir

query stack during panic:
end of query stack

[matthiaskrgr]

smaller

#[crate_name = concat !()]
macro_rules !a {
  () => {}
}
fn main() {}

[cyrgani]

cc @jdonszelmann

[jdonszelmann]

Here we go again 😂. @rustbot claim

[jdonszelmann]

Ah, crate_name probably has similar exceptions as crate type from last time. I know how to fix so that's good :)

[fmease]

Ah, crate_name probably has similar exceptions as crate type from last time.

Yes :) albeit more recent and even stricter: #127581 (merged two weeks ago) :D

[cuviper]

Crater #139827 turned up a few of these as well:

• https://crater-reports.s3.amazonaws.com/beta-1.87-2/beta-2025-04-13/gh/0x4C656F.levi.rs/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.87-2/beta-2025-04-13/gh/Hywan.weld/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.87-2/beta-2025-04-13/gh/oberien.rebo/log.txt

[apiraino]

Assigning priority (discussion on Zulip).

@rustbot label -I-prioritize +P-high

[theemathas]

Minimized from the levi repo (from the crater results):

src/lib.rs:

macro_rules! call_macro {
    ($text:expr) => {
        #[derive(bar::Bar)]
        #[arg($text)]
        pub struct Foo;
    };
}

call_macro!(1 + 1);

bar/src/lib.rs

extern crate proc_macro;

use proc_macro::TokenStream;

#[proc_macro_derive(Bar, attributes(arg))]
pub fn derive_bar(_: proc_macro::TokenStream) -> proc_macro::TokenStream {
    TokenStream::new()
}

Zip of all files required for reproduction: repro.zip