resolve: Avoid finalizing extern prelude entries more than once

compiler/rustc_resolve/src/diagnostics.rs

@@ -1846,7 +1846,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
         let extern_prelude_ambiguity = || {
             self.extern_prelude.get(&Macros20NormalizedIdent::new(ident)).is_some_and(|entry| {
                 entry.item_binding.map(|(b, _)| b) == Some(b1)
-                    && entry.flag_binding.as_ref().and_then(|pb| pb.get().binding()) == Some(b2)
+                    && entry.flag_binding.as_ref().and_then(|pb| pb.get().0.binding()) == Some(b2)
             })
         };
         let (b1, b2, misc1, misc2, swapped) = if b2.span.is_dummy() && !b1.span.is_dummy() {

compiler/rustc_resolve/src/lib.rs

@@ -1031,7 +1031,7 @@ struct ExternPreludeEntry<'ra> {
     /// `flag_binding` is `None`, or when `extern crate` introducing `item_binding` used renaming.
     item_binding: Option<(NameBinding<'ra>, /* introduced by item */ bool)>,
     /// Binding from an `--extern` flag, lazily populated on first use.
-    flag_binding: Option<Cell<PendingBinding<'ra>>>,
+    flag_binding: Option<Cell<(PendingBinding<'ra>, /* finalized */ bool)>>,
 }
 
 impl ExternPreludeEntry<'_> {
@@ -1042,7 +1042,7 @@ impl ExternPreludeEntry<'_> {
     fn flag() -> Self {
         ExternPreludeEntry {
             item_binding: None,
-            flag_binding: Some(Cell::new(PendingBinding::Pending)),
+            flag_binding: Some(Cell::new((PendingBinding::Pending, false))),
         }
     }
 }
@@ -2245,14 +2245,16 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
     fn extern_prelude_get_flag(&self, ident: Ident, finalize: bool) -> Option<NameBinding<'ra>> {
         let entry = self.extern_prelude.get(&Macros20NormalizedIdent::new(ident));
         entry.and_then(|entry| entry.flag_binding.as_ref()).and_then(|flag_binding| {
-            let binding = match flag_binding.get() {
+            let (pending_binding, finalized) = flag_binding.get();
+            let binding = match pending_binding {
                 PendingBinding::Ready(binding) => {
-                    if finalize {
+                    if finalize && !finalized {
                         self.cstore_mut().process_path_extern(self.tcx, ident.name, ident.span);
                     }
                     binding
                 }
                 PendingBinding::Pending => {
+                    debug_assert!(!finalized);
                     let crate_id = if finalize {
                         self.cstore_mut().process_path_extern(self.tcx, ident.name, ident.span)
                     } else {
@@ -2264,7 +2266,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                     })
                 }
             };
-            flag_binding.set(PendingBinding::Ready(binding));
+            flag_binding.set((PendingBinding::Ready(binding), finalize || finalized));
             binding.or_else(|| finalize.then_some(self.dummy_binding))
         })
     }

tests/ui/crate-loading/invalid-rlib.rs

@@ -6,6 +6,3 @@
 #![no_std]
 use ::foo; //~ ERROR invalid metadata files for crate `foo`
 //~| NOTE failed to mmap file
-//~^^ ERROR invalid metadata files for crate `foo`
-//~| NOTE failed to mmap file
-//~| NOTE duplicate diagnostic

tests/ui/crate-loading/invalid-rlib.stderr

@@ -6,15 +6,6 @@ LL | use ::foo;
    |
    = note: failed to mmap file 'auxiliary/libfoo.rlib'
 
-error[E0786]: found invalid metadata files for crate `foo`
-  --> $DIR/invalid-rlib.rs:7:7
-   |
-LL | use ::foo;
-   |       ^^^
-   |
-   = note: failed to mmap file 'auxiliary/libfoo.rlib'
-   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
-
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0786`.