Restrict visibility check to specific HIR items

Author: Urgau

compiler/rustc_lint/src/builtin.rs

@@ -1300,26 +1300,34 @@ impl UnreachablePub {
         {
             // prefer suggesting `pub(super)` instead of `pub(crate)` when possible
             let new_vis = match cx.tcx.opt_parent(def_id.into()) {
-                Some(parent_def_id) => match cx.tcx.visibility(parent_def_id) {
-                    // parent is either `pub(crate)`, `pub(self)` or `pub(in ...)`
-                    ty::Visibility::Restricted(restricted_id) => {
-                        if let Some(local_parent_def_id) = parent_def_id.as_local()
-                            && restricted_id
-                                == cx.tcx.parent_module_from_def_id(local_parent_def_id).into()
-                        {
-                            // parent is `pub(self)`, current item can only be used by parent
-                            "pub(super)"
-                        } else {
-                            // parent is `pub(crate)` or `pub(in ...)`, current item accessible
-                            // from more place then parent
+                Some(parent_def_id) => match cx.tcx.def_kind(parent_def_id) {
+                    // parent is a module, or an impl/extern block, check it's visibility
+                    DefKind::Mod | DefKind::Impl { .. } | DefKind::ForeignMod => match cx
+                        .tcx
+                        .visibility(parent_def_id)
+                    {
+                        // parent is either `pub(crate)`, `pub(self)` or `pub(in ...)`
+                        ty::Visibility::Restricted(restricted_id) => {
+                            if let Some(local_parent_def_id) = parent_def_id.as_local()
+                                && restricted_id
+                                    == cx.tcx.parent_module_from_def_id(local_parent_def_id).into()
+                            {
+                                // parent is `pub(self)`, current item can only be used by parent
+                                "pub(super)"
+                            } else {
+                                // parent is `pub(crate)` or `pub(in ...)`, current item accessible
+                                // from more place then parent
+                                "pub(crate)"
+                            }
+                        }
+                        // parent is `pub`
+                        ty::Visibility::Public => {
+                            // current item may be used from anywhere in the crate
                             "pub(crate)"
                         }
-                    }
-                    // parent is `pub`
-                    ty::Visibility::Public => {
-                        // current item may be used from anywhere in the crate
-                        "pub(crate)"
-                    }
+                    },
+                    // current item can't be accessed outside of the current block
+                    _ => "",
                 },
                 None => "pub(crate)",
             };

tests/ui/lint/unreachable_pub.fixed

@@ -62,6 +62,19 @@ mod private_mod {
         pub(crate) static NITROGEN: usize = 2; //~ WARNING unreachable_pub
     }
 
+    fn foo() {
+        const {
+             struct Foo; //~ WARNING unreachable_pub
+        };
+    }
+
+    enum Weird {
+        Variant = {
+             struct Foo; //~ WARNING unreachable_pub
+            0
+        },
+    }
+
     // items leaked through signatures (see `get_neon` below) are OK
     pub struct Neon {}
 
@@ -84,4 +97,5 @@ fn main() {
     let _ = private_mod::beryllium();
     let _ = private_mod::crate_in_private::CARBON;
     let _ = private_mod::pub_in_private::NITROGEN;
+    let _ = unsafe { private_mod::catalyze() };
 }

tests/ui/lint/unreachable_pub.rs

@@ -62,6 +62,19 @@ mod private_mod {
         pub static NITROGEN: usize = 2; //~ WARNING unreachable_pub
     }
 
+    fn foo() {
+        const {
+            pub struct Foo; //~ WARNING unreachable_pub
+        };
+    }
+
+    enum Weird {
+        Variant = {
+            pub struct Foo; //~ WARNING unreachable_pub
+            0
+        },
+    }
+
     // items leaked through signatures (see `get_neon` below) are OK
     pub struct Neon {}
 
@@ -84,4 +97,5 @@ fn main() {
     let _ = private_mod::beryllium();
     let _ = private_mod::crate_in_private::CARBON;
     let _ = private_mod::pub_in_private::NITROGEN;
+    let _ = unsafe { private_mod::catalyze() };
 }

tests/ui/lint/unreachable_pub.stderr

@@ -146,6 +146,26 @@ LL |     pub mod pub_in_private {
    |
    = help: or consider exporting it for use by other crates
 
+warning: unreachable `pub` item
+  --> $DIR/unreachable_pub.rs:67:13
+   |
+LL |             pub struct Foo;
+   |             ---^^^^^^^^^^^
+   |             |
+   |             help: consider restricting its visibility
+   |
+   = help: or consider exporting it for use by other crates
+
+warning: unreachable `pub` item
+  --> $DIR/unreachable_pub.rs:73:13
+   |
+LL |             pub struct Foo;
+   |             ---^^^^^^^^^^^
+   |             |
+   |             help: consider restricting its visibility
+   |
+   = help: or consider exporting it for use by other crates
+
 warning: unreachable `pub` item
   --> $DIR/unreachable_pub.rs:53:9
    |
@@ -186,5 +206,5 @@ LL |         pub static NITROGEN: usize = 2;
    |
    = help: or consider exporting it for use by other crates
 
-warning: 18 warnings emitted
+warning: 20 warnings emitted