Generics with Enums does not work with name resolution 2.0

[liamnaddell]

Sorry if this is a duplicate, I tried looking for similar ice patterns or issue names. I didn't find anything.

Code

// Works fine
pub struct Bob<T> {
    Bleh: T,
}

// Causes ICE
pub enum ROption<T> {
    RSome(T),
    RNone,
}

fn main() {}

Meta

daa2977

Error output

None

Backtrace

TRS-E14 gccrs-build $ gccrs -frust-name-resolution-2.0 simple_gen2.rs
crab1: internal compiler error: in visit, at rust/resolve/rust-late-name-resolver-2.0.cc:285
0x189d030 Rust::Resolver2_0::Late::visit(Rust::AST::TypePath&)
  ../../gccrs/gcc/rust/resolve/rust-late-name-resolver-2.0.cc:285
0x163dccb Rust::AST::TypePath::accept_vis(Rust::AST::ASTVisitor&)
  ../../gccrs/gcc/rust/ast/rust-path.cc:363
0x16693a5 void Rust::AST::DefaultASTVisitor::visit<Rust::AST::Type>(Rust::AST::Type&)
  ../../gccrs/gcc/rust/ast/rust-ast-visitor.h:406
0x166583a Rust::AST::DefaultASTVisitor::visit(Rust::AST::TupleField&)
  ../../gccrs/gcc/rust/ast/rust-ast-visitor.cc:884
0x1665aea Rust::AST::DefaultASTVisitor::visit(Rust::AST::EnumItemTuple&)
  ../../gccrs/gcc/rust/ast/rust-ast-visitor.cc:912
0x155abe5 Rust::AST::EnumItemTuple::accept_vis(Rust::AST::ASTVisitor&)
  ../../gccrs/gcc/rust/ast/rust-ast.cc:4759
0x166cc3d void Rust::AST::DefaultASTVisitor::visit<Rust::AST::EnumItem>(std::unique_ptr<Rust::AST::EnumItem, std::default_delete<Rust::AST::EnumItem> >&)
  ../../gccrs/gcc/rust/ast/rust-ast-visitor.h:410
0x1665db9 Rust::AST::DefaultASTVisitor::visit(Rust::AST::Enum&)
  ../../gccrs/gcc/rust/ast/rust-ast-visitor.cc:940
0x187d22a operator()
  ../../gccrs/gcc/rust/resolve/rust-default-resolver.cc:106
0x187f52b __invoke_impl<void, Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::Enum&)::<lambda()>&>
  /usr/include/c++/14.2.1/bits/invoke.h:61
0x187ed3c __invoke_r<void, Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::Enum&)::<lambda()>&>
  /usr/include/c++/14.2.1/bits/invoke.h:111
0x187e140 _M_invoke
  /usr/include/c++/14.2.1/bits/std_function.h:290
0x1877cdf std::function<void ()>::operator()() const
  /usr/include/c++/14.2.1/bits/std_function.h:591
0x1876a34 Rust::Resolver2_0::NameResolutionContext::scoped(Rust::Resolver2_0::Rib::Kind, unsigned int, std::function<void ()>, tl::optional<Rust::Identifier>)
  ../../gccrs/gcc/rust/resolve/rust-name-resolution-context.cc:115
0x187d2ee Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::Enum&)
  ../../gccrs/gcc/rust/resolve/rust-default-resolver.cc:108
0x155ac81 Rust::AST::Enum::accept_vis(Rust::AST::ASTVisitor&)
  ../../gccrs/gcc/rust/ast/rust-ast.cc:4777
0x189c342 Rust::Resolver2_0::Late::go(Rust::AST::Crate&)
  ../../gccrs/gcc/rust/resolve/rust-late-name-resolver-2.0.cc:114
0x168fcff Rust::Session::compile_crate(char const*)
  ../../gccrs/gcc/rust/rust-session-manager.cc:635
0x168f290 Rust::Session::handle_input_files(int, char const**)
  ../../gccrs/gcc/rust/rust-session-manager.cc:418
0x14fdfc2 grs_langhook_parse_file
  ../../gccrs/gcc/rust/rust-lang.cc:165
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.

[liamnaddell]

Issue seems to have been introduced by #3171

[liamnaddell]

This blocks #3094

[liamnaddell]

If I understand, we rust_unreachable() because T was supposed to be resolved, but wasn't. I'm not sure why this works for structs, but doesn't work for enums.