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

[matthiaskrgr]

auto-reduced (treereduce-rust):

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

original:

#![cfg(feature = feature)]

Version information:

4db0cf7

Possibly related line of code:

gccrs/gcc/rust/ast/rust-ast.cc

Lines 4034 to 4046 in 4db0cf7

	}
	bool
	MetaItemPathExpr::check_cfg_predicate (const Session &session) const
	{
	// FIXME: Accept path expressions
	rust_assert (expr->is_literal ());
	return session.options.target_data.has_key_value_pair (path.as_string (),
	expr->as_string ());
	}
	std::vector<std::unique_ptr<Token>>
	Token::to_token_stream () const

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
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Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.