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

[matthiaskrgr]

auto-reduced (treereduce-rust):

#[crate_type = concat!("my", "crate")]

macro_rules! foo {
    () => {
        32
    };
}

fn main() {}

original:

//~^ ERROR malformed
#[crate_type = concat!("my", "crate")] //~ ERROR cannot find macro `foo` in this scope

macro_rules! foo {
    () => { 32 }
}

fn main() {}

Version information

rustc 1.91.0-nightly (269d5b56b 2025-08-27)
binary: rustc
commit-hash: 269d5b56bcfdf2be82213e72ef9a2e4c592a8c6b
commit-date: 2025-08-27
host: x86_64-unknown-linux-gnu
release: 1.91.0-nightly
LLVM version: 21.1.0

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc

Program output

warning: unused macro definition: `foo`
 --> /tmp/icemaker_global_tempdir.C8L3MqGBk9J6/rustc_testrunner_tmpdir_reporting.t3XP8hMccBjq/mvce.rs:3:14
  |
3 | macro_rules! foo {
  |              ^^^
  |
  = note: `#[warn(unused_macros)]` (part of `#[warn(unused)]`) on by default

warning: crate-level attribute should be an inner attribute
 --> /tmp/icemaker_global_tempdir.C8L3MqGBk9J6/rustc_testrunner_tmpdir_reporting.t3XP8hMccBjq/mvce.rs:1:1
  |
1 | #[crate_type = concat!("my", "crate")]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(unused_attributes)]` (part of `#[warn(unused)]`) on by default
help: add a `!`
  |
1 | #![crate_type = concat!("my", "crate")]
  |  +

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.C8L3MqGBk9J6/rustc_testrunner_tmpdir_reporting.t3XP8hMccBjq/mvce.rs:1:1
  |
1 | #[crate_type = concat!("my", "crate")]
  | ^^^^^^^^^^^^^^
  |
note: delayed at /rustc-dev/269d5b56bcfdf2be82213e72ef9a2e4c592a8c6b/compiler/rustc_attr_parsing/src/interface.rs:355:43
         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::configure_and_expand
        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.C8L3MqGBk9J6/rustc_testrunner_tmpdir_reporting.t3XP8hMccBjq/mvce.rs:1:1
  |
1 | #[crate_type = concat!("my", "crate")]
  | ^^^^^^^^^^^^^^

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 1.91.0-nightly (269d5b56b 2025-08-27) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack

[theemathas]

Also happens with the attributes:

• windows_subsystem
• recursion_limit
• type_length_limit

#[windows_subsystem = concat!("a", "b")]
macro_rules! foo {
    () => {
        32
    };
}

[fmease]

This will go away once they're all ported to use the new parsing API