Auto merge of #124517 - Mark-Simulacrum:stable-next, r=Mark-Simulacrum 1.78.0

[stable] 1.78 (round 2)

This backports "Don't trigger `unused_qualifications` on global paths" (https://github.com/rust-lang/rust/pull/122435).

r? `@Mark-Simulacrum`

1 files changed, 7 insertions, 0 deletions

diff --git a/compiler/rustc_resolve/src/late.rs b/compiler/rustc_resolve/src/late.rs
index 837c069b599..c661be3587e 100644
--- a/compiler/rustc_resolve/src/late.rs
+++ b/compiler/rustc_resolve/src/late.rs
@@ -4665,6 +4665,13 @@ impl<'a: 'ast, 'b, 'ast, 'tcx> LateResolutionVisitor<'a, 'b, 'ast, 'tcx> {
     }
 
     fn lint_unused_qualifications(&mut self, path: &[Segment], ns: Namespace, finalize: Finalize) {
+        // Don't lint on global paths because the user explicitly wrote out the full path.
+        if let Some(seg) = path.first()
+            && seg.ident.name == kw::PathRoot
+        {
+            return;
+        }
+
         if path.iter().any(|seg| seg.ident.span.from_expansion()) {
             return;
         }