ICE in insert_metavar, at rust/expand/rust-macro-expand.h:225
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Since Mar 28, 2025.
bug
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Description
auto-reduced (treereduce-rust):
macro_rules! m {
($b:tt $b:tt) => {
$a $a;
}
}
fn main() {
m!(S struct);
}
original:
// check-pass
#![S(unused)]
macro_rules! m {
($b:tt $b:tt) => {
$a $a; //~ WARN struct is never constructed
}
}
fn main() {
m!(S struct);
}
Version information:
34b0a681598d52de442a0a21c3a7df20bf1485bc
Possibly related line of code:
https://github.com/Rust-GCC/gccrs/blob/34b0a681598d52de442a0a21c3a7df20bf1485bc/gcc/rust/expand/rust-macro-expand.h#L219-L231
Command:
crab1 -Warray-bounds -mtune=generic -march=x86-64 -O0 -L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib64 -frust-incomplete-and-experimental-compiler-do-not-use
Program output
crab1: internal compiler error: in insert_metavar, at rust/expand/rust-macro-expand.h:225
0x86437f Rust::SubstitutionScope::insert_metavar(Rust::MatchedFragment)
../../gcc/rust/expand/rust-macro-expand.h:225
0x86437f Rust::MacroExpander::match_matcher(Rust::Parser<Rust::MacroInvocLexer>&, Rust::AST::MacroMatcher&, bool, bool)
../../gcc/rust/expand/rust-macro-expand.cc:517
0xc82272 Rust::MacroExpander::match_matcher(Rust::Parser<Rust::MacroInvocLexer>&, Rust::AST::MacroMatcher&, bool, bool)
/usr/include/c++/14.2.1/bits/stl_construct.h:162
0xc82272 Rust::MacroExpander::try_match_rule(Rust::AST::MacroRule&, Rust::AST::DelimTokenTree&)
../../gcc/rust/expand/rust-macro-expand.cc:376
0xc82473 Rust::MacroExpander::expand_decl_macro(unsigned int, Rust::AST::MacroInvocData&, Rust::AST::MacroRulesDefinition&, Rust::AST::InvocKind)
../../gcc/rust/expand/rust-macro-expand.cc:90
0xc8328b Rust::MacroExpander::expand_invoc(Rust::AST::MacroInvocation&, Rust::AST::InvocKind)
../../gcc/rust/expand/rust-macro-expand.cc:305
0xd3e9e0 void Rust::ExpandVisitor::expand_macro_children<std::vector<std::unique_ptr<Rust::AST::Stmt, std::default_delete<Rust::AST::Stmt> >, std::allocator<std::unique_ptr<Rust::AST::Stmt, std::default_delete<Rust::AST::Stmt> > > >, std::unique_ptr<Rust::AST::Stmt, std::default_delete<Rust::AST::Stmt> > >(std::vector<std::unique_ptr<Rust::AST::Stmt, std::default_delete<Rust::AST::Stmt> >, std::allocator<std::unique_ptr<Rust::AST::Stmt, std::default_delete<Rust::AST::Stmt> > > >&, std::function<std::unique_ptr<Rust::AST::Stmt, std::default_delete<Rust::AST::Stmt> > (Rust::AST::SingleASTNode)>)
../../gcc/rust/expand/rust-expand-visitor.h:133
0xd3e9e0 Rust::ExpandVisitor::expand_inner_stmts(Rust::AST::BlockExpr&)
../../gcc/rust/expand/rust-expand-visitor.cc:330
0xd3fbf0 Rust::ExpandVisitor::visit(Rust::AST::BlockExpr&)
../../gcc/rust/expand/rust-expand-visitor.cc:629
0xd3db40 void Rust::ExpandVisitor::expand_macro_children<std::vector<std::unique_ptr<Rust::AST::Item, std::default_delete<Rust::AST::Item> >, std::allocator<std::unique_ptr<Rust::AST::Item, std::default_delete<Rust::AST::Item> > > >, std::unique_ptr<Rust::AST::Item, std::default_delete<Rust::AST::Item> > >(std::vector<std::unique_ptr<Rust::AST::Item, std::default_delete<Rust::AST::Item> >, std::allocator<std::unique_ptr<Rust::AST::Item, std::default_delete<Rust::AST::Item> > > >&, std::function<std::unique_ptr<Rust::AST::Item, std::default_delete<Rust::AST::Item> > (Rust::AST::SingleASTNode)>)
../../gcc/rust/expand/rust-expand-visitor.h:133
0xd3db40 Rust::ExpandVisitor::expand_inner_items(std::vector<std::unique_ptr<Rust::AST::Item, std::default_delete<Rust::AST::Item> >, std::allocator<std::unique_ptr<Rust::AST::Item, std::default_delete<Rust::AST::Item> > > >&)
../../gcc/rust/expand/rust-expand-visitor.cc:239
0xc46135 Rust::Session::expansion(Rust::AST::Crate&, Rust::Resolver2_0::NameResolutionContext&)
../../gcc/rust/rust-session-manager.cc:959
0xc5bcd1 Rust::Session::compile_crate(char const*)
../../gcc/rust/rust-session-manager.cc:619
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See <https://gcc.gnu.org/bugs/> for instructions.
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