Issues when resolving public unloaded modules

With the following directory structure

test.rs
foo/
    mod.rs
    bar.rs

and the following files:

// test.rs
pub mod foo;

use foo::bar::f;

fn main() {
    f()
}

// foo/mod.rs
pub mod bar;

pub fn f() {}

we fail to name resolve modules and compile the code, whereas rustc does not show any errors.

arthur@platypus ~/G/r/gccrs (master)> build/gcc/crab1 test.rs
test.rs:1:5: error: no candidate found for module foo
    1 | pub mod foo;
      |     ^~~

Analyzing compilation unit

Time variable                                   usr           sys          wall           GGC
 TOTAL                              :   0.00          0.00          0.00          150k
Extra diagnostic checks enabled; compiler may run slowly.
Configure with --enable-checking=release to disable checks.

with name resolution 2.0:

arthur@platypus ~/G/r/gccrs (master) [1]> build/gcc/crab1 test.rs -frust-name-resolution-2.0
test.rs:3:10: error: failed to resolve path segment ‘bar’ [E0433]
    3 | use foo::bar::f;
      |          ^~~
test.rs:3:10: error: failed to resolve path segment ‘bar’ [E0433]
test.rs:3:10: error: failed to resolve path segment ‘bar’ [E0433]
test.rs:3:15: error: unresolved import ‘foo::bar::f’ [E0433]
    3 | use foo::bar::f;
      |               ^
crab1: internal compiler error: in visit, at rust/resolve/rust-late-name-resolver-2.0.cc:205
0x259c2e0 Rust::Resolver2_0::Late::visit(Rust::AST::PathInExpression&)
    /home/arthur/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/resolve/rust-late-name-resolver-2.0.cc:205
0x233fd3d Rust::AST::PathInExpression::accept_vis(Rust::AST::ASTVisitor&)
    /home/arthur/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/ast/rust-path.cc:189
0x236c8ed void Rust::AST::DefaultASTVisitor::visit<Rust::AST::Expr>(Rust::AST::Expr&)
    ../../gcc/rust/ast/rust-ast-visitor.h:396
0x2367c92 Rust::AST::DefaultASTVisitor::visit(Rust::AST::CallExpr&)
    /home/arthur/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/ast/rust-ast-visitor.cc:411
0x225efd0 Rust::AST::CallExpr::accept_vis(Rust::AST::ASTVisitor&)
    /home/arthur/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/ast/rust-ast.cc:4479
0x2581d4d Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::BlockExpr&)::$_0::operator()() const
    /home/arthur/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/resolve/rust-default-resolver.cc:38
0x2581c74 void std::__invoke_impl<void, Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::BlockExpr&)::$_0&>(std::__invoke_other, Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::BlockExpr&)::$_0&)
    /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/13.2.1/../../../../include/c++/13.2.1/bits/invoke.h:61
0x2581c24 std::enable_if<is_invocable_r_v<void, Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::BlockExpr&)::$_0&>, void>::type std::__invoke_r<void, Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::BlockExpr&)::$_0&>(Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::BlockExpr&)::$_0&)
    /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/13.2.1/../../../../include/c++/13.2.1/bits/invoke.h:111
0x2581b4c std::_Function_handler<void (), Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::BlockExpr&)::$_0>::_M_invoke(std::_Any_data const&)
    /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/13.2.1/../../../../include/c++/13.2.1/bits/std_function.h:290
0x257ad24 std::function<void ()>::operator()() const
    /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/13.2.1/../../../../include/c++/13.2.1/bits/std_function.h:591
0x2579a86 Rust::Resolver2_0::NameResolutionContext::scoped(Rust::Resolver2_0::Rib, unsigned int, std::function<void ()>, tl::optional<Rust::Identifier>)
    /home/arthur/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/resolve/rust-name-resolution-context.cc:97
0x257fb8e Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::BlockExpr&)
    /home/arthur/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/resolve/rust-default-resolver.cc:41
0x225f090 Rust::AST::BlockExpr::accept_vis(Rust::AST::ASTVisitor&)
    /home/arthur/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/ast/rust-ast.cc:4503
0x25826a7 Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::Function&)::$_0::operator()() const
    /home/arthur/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/resolve/rust-default-resolver.cc:86
0x25824a4 void std::__invoke_impl<void, Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::Function&)::$_0&>(std::__invoke_other, Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::Function&)::$_0&)
    /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/13.2.1/../../../../include/c++/13.2.1/bits/invoke.h:61
0x2582454 std::enable_if<is_invocable_r_v<void, Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::Function&)::$_0&>, void>::type std::__invoke_r<void, Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::Function&)::$_0&>(Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::Function&)::$_0&)
    /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/13.2.1/../../../../include/c++/13.2.1/bits/invoke.h:111
0x258237c std::_Function_handler<void (), Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::Function&)::$_0>::_M_invoke(std::_Any_data const&)
    /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/13.2.1/../../../../include/c++/13.2.1/bits/std_function.h:290
0x257ad24 std::function<void ()>::operator()() const
    /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/13.2.1/../../../../include/c++/13.2.1/bits/std_function.h:591
0x2579a86 Rust::Resolver2_0::NameResolutionContext::scoped(Rust::Resolver2_0::Rib, unsigned int, std::function<void ()>, tl::optional<Rust::Identifier>)
    /home/arthur/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/resolve/rust-name-resolution-context.cc:97
0x257ff14 Rust::Resolver2_0::DefaultResolver::visit(Rust::AST::Function&)
    /home/arthur/Git/rust-gcc/gccrs/build/gcc/../../gcc/rust/resolve/rust-default-resolver.cc:89
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.

Rust-GCC / gccrs

Issues when resolving public unloaded modules #2986