Error while building with main being extern (a separately compiled C module)

Code

Not minimal, but possibly helpful, from src/lib.rs:

extern {
    #[link(name = "libtestline", kind = "static", link_name = "main")]
    fn main() -> isize;
}

Error output

error: internal compiler error: compiler/rustc_ty_utils/src/ty.rs:461:9: asyncness: expected fn-like node but got `DefId(0:4296 ~ pmu[7eea]::::main)`

thread 'rustc' panicked at 'Box<Any>', compiler/rustc_errors/src/lib.rs:1007:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

note: the compiler unexpectedly panicked. this is a bug.

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: rustc 1.54.0-nightly (6c2dd251b 2021-06-05) running on x86_64-unknown-linux-gnu

note: compiler flags: -C opt-level=3 -C embed-bitcode=no -C opt-level=2 -C linker-plugin-lto=/usr/local/llvm-12.0.1-rc1/lib/LLVMgold.so -C linker=clang -C link-arg=-flto=full -C link-arg=-fuse-ld=/usr/local/llvm-12.0.1-rc1/bin/ld.lld -C target-cpu=x86-64 --crate-type bin

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [asyncness] checking if the function is async: `main`
#1 [analysis] running analysis passes on this crate
end of query stack

Backtrace

stack backtrace:
   0: std::panicking::begin_panic
   1: std::panic::panic_any
   2: rustc_errors::HandlerInner::bug
   3: rustc_errors::Handler::bug
   4: rustc_middle::ty::context::tls::with_opt
   5: rustc_middle::util::bug::opt_span_bug_fmt
   6: rustc_middle::util::bug::bug_fmt
   7: rustc_ty_utils::ty::asyncness
   8: rustc_query_system::query::plumbing::get_query_impl
   9: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::asyncness
  10: rustc_typeck::check_for_entry_fn
  11: rustc_typeck::check_crate
  12: rustc_interface::passes::analysis
  13: rustc_query_system::query::plumbing::get_query_impl
  14: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
  15: rustc_interface::passes::QueryContext::enter
  16: rustc_span::with_session_globals

@rustbot

Assigning priority as discussed in the Zulip thread of the Prioritization Working Group.

@rustbot label -I-prioritize +P-low

This appears to have been caused by #84401

@rustbot

@rustbot claim

~~A potential duplicate~~

union Foo {
    a: isize,
    b: &T,
}
enum Bar {
    Boo = [Foo { b: () }.a][3],
}

No that's a completely different error

No that's a completely different error

Sorry I misread the error message, It is probably a duplicate of #83531

Yep, that looks very similar

Auto merge of rust-lang#86190 - asquared31415:extern-main-86110-fix, …

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Error while building with main being extern (a separately compiled C module) #86110

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Error while building with main being extern (a separately compiled C module) #86110

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apiraino commented on Jun 8, 2021

asquared31415 commented on Jun 9, 2021

asquared31415 commented on Jun 9, 2021

Cancelll commented on Jun 10, 2021

asquared31415 commented on Jun 10, 2021

Cancelll commented on Jun 10, 2021

asquared31415 commented on Jun 10, 2021

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