Correct warning message in restricted visibility

compiler/rustc_middle/src/ty/mod.rs

@@ -297,7 +297,10 @@ impl Visibility {
                 } else if restricted_id == tcx.parent_module_from_def_id(def_id).to_local_def_id() {
                     "pub(self)".to_string()
                 } else {
-                    format!("pub({})", tcx.item_name(restricted_id.to_def_id()))
+                    format!(
+                        "pub(in crate{})",
+                        tcx.def_path(restricted_id.to_def_id()).to_string_no_crate_verbose()
+                    )
                 }
             }
             ty::Visibility::Public => "pub".to_string(),

tests/ui/imports/reexports.stderr

@@ -62,7 +62,7 @@ warning: glob import doesn't reexport anything with visibility `pub` because no
 LL |         pub use super::*;
    |                 ^^^^^^^^
    |
-note: the most public imported item is `pub(a)`
+note: the most public imported item is `pub(in crate::a)`
   --> $DIR/reexports.rs:11:17
    |
 LL |         pub use super::*;

tests/ui/pub/pub-restricted-warning.rs

@@ -0,0 +1,25 @@
+//@ check-pass
+
+#![allow(dead_code)]
+
+mod outer {
+    pub mod inner {
+        pub(in crate::outer) struct Foo;
+        pub fn bar() -> Foo {
+            //~^ WARNING type `Foo` is more private than the item `outer::inner::bar` [private_interfaces]
+            Foo
+        }
+    }
+
+    pub mod nested {
+        pub mod inner {
+            pub(in crate::outer::nested) struct NestedFoo;
+            pub fn bar() -> NestedFoo {
+                //~^ WARNING type `NestedFoo` is more private than the item `nested::inner::bar` [private_interfaces]
+                NestedFoo
+            }
+        }
+    }
+}
+
+fn main() {}

tests/ui/pub/pub-restricted-warning.stderr

@@ -0,0 +1,27 @@
+warning: type `Foo` is more private than the item `outer::inner::bar`
+  --> $DIR/pub-restricted-warning.rs:8:9
+   |
+LL |         pub fn bar() -> Foo {
+   |         ^^^^^^^^^^^^^^^^^^^ function `outer::inner::bar` is reachable at visibility `pub(crate)`
+   |
+note: but type `Foo` is only usable at visibility `pub(in crate::outer)`
+  --> $DIR/pub-restricted-warning.rs:7:9
+   |
+LL |         pub(in crate::outer) struct Foo;
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = note: `#[warn(private_interfaces)]` on by default
+
+warning: type `NestedFoo` is more private than the item `nested::inner::bar`
+  --> $DIR/pub-restricted-warning.rs:17:13
+   |
+LL |             pub fn bar() -> NestedFoo {
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^ function `nested::inner::bar` is reachable at visibility `pub(crate)`
+   |
+note: but type `NestedFoo` is only usable at visibility `pub(in crate::outer::nested)`
+  --> $DIR/pub-restricted-warning.rs:16:13
+   |
+LL |             pub(in crate::outer::nested) struct NestedFoo;
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+warning: 2 warnings emitted
+