ICE `in check_cfg_predicate, at rust/ast/rust-ast.cc... | Rust-GCC/gccrs

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auto-reduced (treereduce-rust):

//@compile-flags: -frust-incomplete-and-experimental-compiler-do-not-use
#![cfg(feature = feature)]

original:

#![cfg(feature = feature)]

Version information:

4db0cf74f64086e2bb2eff029c597239df8442e1

Command:
/home/matthias/vcs/github/gccrs/gccrs-build/gcc/crab1 -frust-incomplete-and-experimental-compiler-do-not-use

Program output

crab1: internal compiler error: in check_cfg_predicate, at rust/ast/rust-ast.cc:4040
0x301e249 internal_error(char const*, ...)
	../../gcc/diagnostic-global-context.cc:786
0xc22881 fancy_abort(char const*, int, char const*)
	../../gcc/diagnostics/context.cc:1787
0x900a5d Rust::AST::MetaItemPathExpr::check_cfg_predicate(Rust::Session const&) const
	../../gcc/rust/ast/rust-ast.cc:4040
0x900a5d Rust::AST::MetaItemPathExpr::check_cfg_predicate(Rust::Session const&) const
	../../gcc/rust/ast/rust-ast.cc:4037
0xdf160c Rust::AST::Attribute::check_cfg_predicate(Rust::Session const&) const
	../../gcc/rust/ast/rust-ast.cc:4196
0xeac38e Rust::CfgStrip::fails_cfg_with_expand(std::vector<Rust::AST::Attribute, std::allocator<Rust::AST::Attribute> >&) const
	../../gcc/rust/expand/rust-cfg-strip.cc:75
0xeaee66 Rust::CfgStrip::visit(Rust::AST::Crate&)
	../../gcc/rust/expand/rust-cfg-strip.cc:156
0xe7a118 Rust::Session::expansion(Rust::AST::Crate&, Rust::Resolver2_0::NameResolutionContext&)
	../../gcc/rust/rust-session-manager.cc:943
0xe87165 Rust::Session::compile_crate(char const*)
	../../gcc/rust/rust-session-manager.cc:618
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.

Start by reproducing the reduced case with crab1 and the listed compile flag, then read rust/ast/rust-ast.cc around lines 4034-4046 and the reported CfgStrip call path. Done means the input no longer triggers an internal compiler error; add regression coverage if the repository’s existing compiler tests identify a suitable location.

Written by the indexing model from the issue text.

ICE `in check_cfg_predicate, at rust/ast/rust-ast.cc:4040` `#![cfg(feature = feature)]`

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