resolve: Mark items under ambigous imports as exported

Author: petrochenkov

compiler/rustc_resolve/src/effective_visibilities.rs

@@ -96,13 +96,10 @@ impl<'a, 'ra, 'tcx> EffectiveVisibilitiesVisitor<'a, 'ra, 'tcx> {
         // is the maximum value among visibilities of declarations corresponding to that def id.
         for (decl, eff_vis) in visitor.import_effective_visibilities.iter() {
             let DeclKind::Import { import, .. } = decl.kind else { unreachable!() };
-            if !decl.is_ambiguity_recursive() {
-                if let Some(node_id) = import.id() {
-                    r.effective_visibilities.update_eff_vis(r.local_def_id(node_id), eff_vis, r.tcx)
-                }
-            } else if decl.ambiguity.get().is_some()
-                && eff_vis.is_public_at_level(Level::Reexported)
-            {
+            if let Some(node_id) = import.id() {
+                r.effective_visibilities.update_eff_vis(r.local_def_id(node_id), eff_vis, r.tcx)
+            }
+            if decl.ambiguity.get().is_some() && eff_vis.is_public_at_level(Level::Reexported) {
                 exported_ambiguities.insert(*decl);
             }
         }
@@ -123,31 +120,13 @@ impl<'a, 'ra, 'tcx> EffectiveVisibilitiesVisitor<'a, 'ra, 'tcx> {
             // Set the given effective visibility level to `Level::Direct` and
             // sets the rest of the `use` chain to `Level::Reexported` until
             // we hit the actual exported item.
-            //
-            // If the binding is ambiguous, put the root ambiguity binding and all reexports
-            // leading to it into the table. They are used by the `ambiguous_glob_reexports`
-            // lint. For all bindings added to the table this way `is_ambiguity` returns true.
-            let is_ambiguity =
-                |decl: Decl<'ra>, warn: bool| decl.ambiguity.get().is_some() && !warn;
             let mut parent_id = ParentId::Def(module_id);
-            let mut warn_ambiguity = decl.warn_ambiguity.get();
             while let DeclKind::Import { source_decl, .. } = decl.kind {
                 self.update_import(decl, parent_id);
-
-                if is_ambiguity(decl, warn_ambiguity) {
-                    // Stop at the root ambiguity, further bindings in the chain should not
-                    // be reexported because the root ambiguity blocks any access to them.
-                    // (Those further bindings are most likely not ambiguities themselves.)
-                    break;
-                }
-
                 parent_id = ParentId::Import(decl);
                 decl = source_decl;
-                warn_ambiguity |= source_decl.warn_ambiguity.get();
             }
-            if !is_ambiguity(decl, warn_ambiguity)
-                && let Some(def_id) = decl.res().opt_def_id().and_then(|id| id.as_local())
-            {
+            if let Some(def_id) = decl.res().opt_def_id().and_then(|id| id.as_local()) {
                 self.update_def(def_id, decl.vis().expect_local(), parent_id);
             }
         }

tests/rustdoc-html/glob-shadowing.rs

@@ -1,9 +1,9 @@
 //@ has 'glob_shadowing/index.html'
-//@ count - '//dt' 6
-//@ !has - '//dd' 'sub1::describe'
+//@ count - '//dt' 7
+//@ !has - '//dd' 'sub1::describe1'
 //@ has - '//dd' 'sub2::describe'
 
-//@ !has - '//dd' 'sub1::describe2'
+//@ has - '//dd' 'sub1::describe2'
 
 //@ !has - '//dd' 'sub1::prelude'
 //@ has - '//dd' 'mod::prelude'
@@ -18,7 +18,7 @@
 
 mod sub1 {
     // this should be shadowed by sub2::describe
-    /// sub1::describe
+    /// sub1::describe1
     pub fn describe() -> &'static str {
         "sub1::describe"
     }
@@ -33,7 +33,9 @@ mod sub1 {
     pub struct Foo;
 
     // this should be shadowed,
-    // because both sub1::describe2 and sub3::describe2 are from glob reexport
+    // because both sub1::describe2 and sub3::describe2 are from glob reexport,
+    // but it is still usable from other crates under the `ambiguous_glob_imports` lint,
+    // so it is reachable and documented
     /// sub1::describe2
     pub fn describe2() -> &'static str {
         "sub1::describe2"

tests/rustdoc-json/reexport/glob_collision.rs

@@ -1,7 +1,9 @@
 // Regression test for https://github.com/rust-lang/rust/issues/100973
+// Update: the rules has changed after #147984, one of the colliding items is now available
+// from other crates under a deprecation lint.
 
 //@ set m1 = "$.index[?(@.name == 'm1' && @.inner.module)].id"
-//@ is "$.index[?(@.name == 'm1')].inner.module.items" []
+//@ is "$.index[?(@.name == 'm1')].inner.module.items" [0]
 //@ is "$.index[?(@.name == 'm1')].inner.module.is_stripped" true
 mod m1 {
     pub fn f() {}

tests/ui/imports/ambiguous-reachable.rs

@@ -1,10 +1,8 @@
-//@ build-fail
+//@ build-pass
 //@ aux-crate: ambiguous_reachable_extern=ambiguous-reachable-extern.rs
 
 #![allow(ambiguous_glob_imports)]
 
 fn main() {
     ambiguous_reachable_extern::generic::<u8>();
 }
-
-//~? ERROR missing optimized MIR

tests/ui/imports/ambiguous-reachable.stderr

@@ -1,13 +1,3 @@
-error: missing optimized MIR for `ambiguous_reachable_extern::m1::generic::<u8>` in the crate `ambiguous_reachable_extern`
-   |
-note: missing optimized MIR for this item (was the crate `ambiguous_reachable_extern` compiled with `--emit=metadata`?)
-  --> $DIR/auxiliary/ambiguous-reachable-extern.rs:2:5
-   |
-LL |     pub fn generic<T>() {
-   |     ^^^^^^^^^^^^^^^^^^^
-
-error: aborting due to 1 previous error
-
 Future incompatibility report: Future breakage diagnostic:
 warning: `generic` is ambiguous
   --> $DIR/ambiguous-reachable.rs:7:33