[gcc/devel/rust/master] rust-ast-resolve-item: Add note about resolving glob uses

[Thomas Schwinge <tschwinge@gcc.gnu.org>]

https://gcc.gnu.org/g:3dc104bc8aaf3edf7aa59b11efacdd9349054df7

commit 3dc104bc8aaf3edf7aa59b11efacdd9349054df7
Author: Arthur Cohen <arthur.cohen@embecosm.com>
Date:   Tue Oct 11 11:39:15 2022 +0200

    rust-ast-resolve-item: Add note about resolving glob uses

Diff:
---
 gcc/rust/resolve/rust-ast-resolve-item.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/gcc/rust/resolve/rust-ast-resolve-item.cc b/gcc/rust/resolve/rust-ast-resolve-item.cc
index 0c38f28d530..7f45161fa14 100644
--- a/gcc/rust/resolve/rust-ast-resolve-item.cc
+++ b/gcc/rust/resolve/rust-ast-resolve-item.cc
@@ -968,6 +968,14 @@ ResolveItem::visit (AST::UseDeclaration &use_item)
 {
   auto to_resolve = flatten_use_dec_to_paths (use_item);
 
+  // FIXME: I think this does not actually resolve glob use-decls and is going
+  // the wrong way about it. RFC #1560 specifies the following:
+  //
+  // > When we find a glob import, we have to record a 'back link', so that when
+  // a public name is added for the supplying module, we can add it for the
+  // importing module.
+  //
+  // Which is the opposite of what we're doing if I understand correctly?
   for (auto &path : to_resolve)
     ResolvePath::go (&path);
 }