ICE: `in insert_function_decl, at rust/backend/rust-compile-context.h` recursive method
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@philberty is already working on this.
Since Sep 17, 2026.
bug
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Description
auto-reduced (treereduce-rust):
//@compile-flags: -frust-incomplete-and-experimental-compiler-do-not-use
trait Trait {
fn method(&self) {
struct S;
impl Trait for S {}
S.method();
}
}
fn main() {
struct S;
S.method();
}
original:
// check-pass
trait Trait {
fn method(&self) {
// Items inside a block turn it into a module internally.
struct S;
impl Trait for S {}
// OK, `Trait` is in scope here from method resolution point of view.
S.method();
}
}
fn main() {
// Items inside a block turn it into a module internally.
struct S;
impl Trait for S {}
// OK, `Trait` is in scope here from method resolution point of view.
S.method();
}
Version information:
5c3e2adc695b04a199d37cacd8c23b14fdab914f
Possibly related line of code:
https://github.com/Rust-GCC/gccrs/blob/5c3e2adc695b04a199d37cacd8c23b14fdab914f/gcc/rust/backend/rust-compile-context.h#L144-L156
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 insert_function_decl, at rust/backend/rust-compile-context.h:150
0x2fec938 internal_error(char const*, ...)
../../gcc/diagnostic-global-context.cc:517
0xc0dfbb fancy_abort(char const*, int, char const*)
../../gcc/diagnostic.cc:1803
0xdd095e Rust::Compile::Context::insert_function_decl(Rust::TyTy::FnType const*, tree_node*)
../../gcc/rust/backend/rust-compile-context.h:150
0x118d1a8 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:726
0x115934c Rust::Compile::CompileTraitItem::visit(Rust::HIR::TraitItemFunc&)
../../gcc/rust/backend/rust-compile-implitem.cc:98
0x118afed Rust::Compile::CompileTraitItem::Compile(Rust::HIR::TraitItem*, Rust::Compile::Context*, Rust::TyTy::BaseType*, bool, unsigned long)
../../gcc/rust/backend/rust-compile-implitem.h:55
0x118afed Rust::Compile::HIRCompileBase::resolve_method_address(Rust::TyTy::FnType*, Rust::TyTy::BaseType*, unsigned long)
../../gcc/rust/backend/rust-compile-base.cc:972
0x1167563 Rust::Compile::CompileExpr::visit(Rust::HIR::MethodCallExpr&)
../../gcc/rust/backend/rust-compile-expr.cc:1447
0x1162ab6 Rust::Compile::CompileExpr::Compile(Rust::HIR::Expr&, Rust::Compile::Context*)
../../gcc/rust/backend/rust-compile-expr.cc:48
0x11596d0 ???
../../gcc/rust/backend/rust-compile-stmt.h:33
0x11599bc Rust::Compile::CompileStmt::Compile(Rust::HIR::Stmt*, Rust::Compile::Context*)
../../gcc/rust/backend/rust-compile-stmt.cc:36
0x118a83c Rust::Compile::HIRCompileBase::compile_function_body(tree_node*, Rust::HIR::BlockExpr&, Rust::TyTy::BaseType*)
../../gcc/rust/backend/rust-compile-base.cc:613
0x118d7c0 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:791
0x115934c Rust::Compile::CompileTraitItem::visit(Rust::HIR::TraitItemFunc&)
../../gcc/rust/backend/rust-compile-implitem.cc:98
0x118afed Rust::Compile::CompileTraitItem::Compile(Rust::HIR::TraitItem*, Rust::Compile::Context*, Rust::TyTy::BaseType*, bool, unsigned long)
../../gcc/rust/backend/rust-compile-implitem.h:55
0x118afed Rust::Compile::HIRCompileBase::resolve_method_address(Rust::TyTy::FnType*, Rust::TyTy::BaseType*, unsigned long)
../../gcc/rust/backend/rust-compile-base.cc:972
0x1167563 Rust::Compile::CompileExpr::visit(Rust::HIR::MethodCallExpr&)
../../gcc/rust/backend/rust-compile-expr.cc:1447
0x1162ab6 Rust::Compile::CompileExpr::Compile(Rust::HIR::Expr&, Rust::Compile::Context*)
../../gcc/rust/backend/rust-compile-expr.cc:48
0x11596d0 ???
../../gcc/rust/backend/rust-compile-stmt.h:33
0x11599bc Rust::Compile::CompileStmt::Compile(Rust::HIR::Stmt*, Rust::Compile::Context*)
../../gcc/rust/backend/rust-compile-stmt.cc:36
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