From 3ee74ae580e5491aba25ab8a934fb96b876fe385 Mon Sep 17 00:00:00 2001
From: Vadim Petrochenkov <vadim.petrochenkov@gmail.com>
Date: Fri, 27 Mar 2026 19:23:37 +0300
Subject: [PATCH] resolve: Never lookup glob names in modules from other crates

---
 compiler/rustc_resolve/src/ident.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/compiler/rustc_resolve/src/ident.rs b/compiler/rustc_resolve/src/ident.rs
index 1c53d5d03fd6..069018139145 100644
--- a/compiler/rustc_resolve/src/ident.rs
+++ b/compiler/rustc_resolve/src/ident.rs
@@ -638,6 +638,13 @@ fn resolve_ident_in_scope<'r>(
                     Err(ControlFlow::Break(..)) => return decl,
                 }
             }
+            Scope::ModuleGlobs(module, _)
+                if let ModuleKind::Def(_, def_id, _) = module.kind
+                    && !def_id.is_local() =>
+            {
+                // Fast path: external module decoding only creates non-glob declarations.
+                Err(Determined)
+            }
             Scope::ModuleGlobs(module, derive_fallback_lint_id) => {
                 let (adjusted_parent_scope, adjusted_finalize) = if matches!(
                     scope_set,