ICE in compile_function fn that calls a main() with... | Rust-GCC/gccrs

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auto-reduced (treereduce-rust):

//@compile-flags: -frust-incomplete-and-experimental-compiler-do-not-use -frust-crate-attr=no_core
fn foo(f: for<'a, 'b> fn(&'a ()) -> &'a &'b ()) {
    main(f);
}

fn main(f: for<'a, 'b> fn(&'a ()) -> &'a &'b ()) {}

original:

fn foo(f: for<'a,'b> fn(&'a ()) -> &'a &'b ()) {
    main(f);
}

fn bar(f: for<'a,'b> fn(&'b ()) -> &'a &'b ()) {
}

fn main(f: for<'a,'b> fn(&'a ()) -> &'a &'b ()) {
}

Version information:

206d052f0c25feb613d28fcd71877db7db089c14

Command:
/home/matthias/vcs/github/gccrs/gccrs-build/gcc/crab1 -frust-incomplete-and-experimental-compiler-do-not-use -frust-crate-attr=no_core -frust-crate-attr=feature(no_core)

Program output

crab1: internal compiler error: in compile_function, at rust/backend/rust-compile-base.cc:778
0x32c99c7 internal_error(char const*, ...)
	../../gcc/diagnostic-global-context.cc:787
0xc7f8e1 fancy_abort(char const*, int, char const*)
	../../gcc/diagnostics/context.cc:1813
0x92fe17 Rust::Compile::HIRCompileBase::compile_function(bool, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, tl::optional<Rust::HIR::SelfParam>&, std::vector<Rust::HIR::FunctionParam, std::allocator<Rust::HIR::FunctionParam> >&, Rust::HIR::FunctionQualifiers const&, Rust::HIR::Visibility&, std::vector<Rust::AST::Attribute, std::allocator<Rust::AST::Attribute> >&, unsigned long, Rust::HIR::BlockExpr*, Rust::Resolver::CanonicalPath const&, Rust::TyTy::FnType*)
	../../gcc/rust/backend/rust-compile-base.cc:778
0x11b41c6 Rust::Compile::CompileItem::visit(Rust::HIR::Function&)
	../../gcc/rust/backend/rust-compile-item.cc:235
0xed548b Rust::Compile::CompileItem::compile(Rust::HIR::Item*, Rust::Compile::Context*, Rust::TyTy::BaseType*, unsigned long)
	../../gcc/rust/backend/rust-compile-item.h:37
0xed548b Rust::Compile::CompileCrate::go()
	../../gcc/rust/backend/rust-compile.cc:49
0xed548b Rust::Compile::CompileCrate::Compile(Rust::HIR::Crate&, Rust::Compile::Context*)
	../../gcc/rust/backend/rust-compile.cc:42
0xec9767 Rust::Session::compile_crate(char const*)
	../../gcc/rust/rust-session-manager.cc:851
/home/matthias/vcs/github/gccrs/gccrs-build/gcc/crab1 /tmp/icemaker_global_tempdir.uWTdLfAKpi0h/rustc_testrunner_tmpdir_reporting.hTgc1cbPBU8d/mvce.rs -o/tmp/icemaker_global_tempdir.uWTdLfAKpi0h/rustc_testrunner_tmpdir_reporting.hTgc1cbPBU8d/binaryname -frust-incomplete-and-experimental-compiler-do-not-use -frust-crate-attr=no_core -frust-crate-attr=feature(no_core)
Please submit a full bug report, with preprocessed source (by using -freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

Run the reduced Rust reproducer with the listed flags, then inspect gcc/rust/backend/rust-compile-base.cc:772-784 and the compile_function path shown in the backtrace. Done means this input no longer triggers an internal compiler error and the compiler handles it normally.

Written by the indexing model from the issue text.

ICE in compile_function fn that calls a main() with arguments

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