Add items to DocAliasBadLocation check error match arm

- Added `Impl`, `Closure`, ForeignMod` targets
- `Target::name` changed for `Target::Impl`
- Error output for `Target::ForeignMod` changed to "foreign module"

Author: hdelc

compiler/rustc_hir/src/target.rs

@@ -162,7 +162,7 @@ impl Target {
             Target::Union => "union",
             Target::Trait => "trait",
             Target::TraitAlias => "trait alias",
-            Target::Impl => "item",
+            Target::Impl => "implementation block",
             Target::Expression => "expression",
             Target::Statement => "statement",
             Target::Arm => "match arm",

compiler/rustc_passes/src/check_attr.rs

@@ -596,8 +596,6 @@ impl CheckAttrVisitor<'_> {
 
         let span = meta.span();
         if let Some(location) = match target {
-            Target::Impl => Some("implementation block"),
-            Target::ForeignMod => Some("extern block"),
             Target::AssocTy => {
                 let parent_hir_id = self.tcx.hir().get_parent_item(hir_id);
                 let containing_item = self.tcx.hir().expect_item(parent_hir_id);
@@ -619,13 +617,17 @@ impl CheckAttrVisitor<'_> {
             }
             // we check the validity of params elsewhere
             Target::Param => return false,
-            Target::Expression | Target::Statement | Target::Arm => Some(target.name()),
+            Target::Expression
+            | Target::Statement
+            | Target::Arm
+            | Target::ForeignMod
+            | Target::Closure
+            | Target::Impl => Some(target.name()),
             Target::ExternCrate
             | Target::Use
             | Target::Static
             | Target::Const
             | Target::Fn
-            | Target::Closure
             | Target::Mod
             | Target::GlobalAsm
             | Target::TyAlias

src/test/rustdoc-ui/check-doc-alias-attr-location.stderr

@@ -1,4 +1,4 @@
-error: `#[doc(alias = "...")]` isn't allowed on extern block
+error: `#[doc(alias = "...")]` isn't allowed on foreign module
   --> $DIR/check-doc-alias-attr-location.rs:7:7
    |
 LL | #[doc(alias = "foo")]

src/test/ui/feature-gates/issue-43106-gating-of-builtin-attrs.stderr

@@ -212,7 +212,7 @@ note: the lint level is defined here
 LL | #![warn(unused_attributes, unknown_lints)]
    |         ^^^^^^^^^^^^^^^^^
 
-warning: `#[automatically_derived]` only has an effect on items
+warning: `#[automatically_derived]` only has an effect on implementation blocks
   --> $DIR/issue-43106-gating-of-builtin-attrs.rs:266:1
    |
 LL | #[automatically_derived]
@@ -515,25 +515,25 @@ warning: `#[path]` only has an effect on modules
 LL |     #[path = "3800"] impl S { }
    |     ^^^^^^^^^^^^^^^^
 
-warning: `#[automatically_derived]` only has an effect on items
+warning: `#[automatically_derived]` only has an effect on implementation blocks
   --> $DIR/issue-43106-gating-of-builtin-attrs.rs:269:17
    |
 LL |     mod inner { #![automatically_derived] }
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^
 
-warning: `#[automatically_derived]` only has an effect on items
+warning: `#[automatically_derived]` only has an effect on implementation blocks
   --> $DIR/issue-43106-gating-of-builtin-attrs.rs:272:5
    |
 LL |     #[automatically_derived] fn f() { }
    |     ^^^^^^^^^^^^^^^^^^^^^^^^
 
-warning: `#[automatically_derived]` only has an effect on items
+warning: `#[automatically_derived]` only has an effect on implementation blocks
   --> $DIR/issue-43106-gating-of-builtin-attrs.rs:275:5
    |
 LL |     #[automatically_derived] struct S;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^
 
-warning: `#[automatically_derived]` only has an effect on items
+warning: `#[automatically_derived]` only has an effect on implementation blocks
   --> $DIR/issue-43106-gating-of-builtin-attrs.rs:278:5
    |
 LL |     #[automatically_derived] type T = S;
@@ -923,7 +923,7 @@ warning: `#[must_use]` has no effect when applied to a type alias
 LL |     #[must_use] type T = S;
    |     ^^^^^^^^^^^
 
-warning: `#[must_use]` has no effect when applied to an item
+warning: `#[must_use]` has no effect when applied to an implementation block
   --> $DIR/issue-43106-gating-of-builtin-attrs.rs:614:5
    |
 LL |     #[must_use] impl S { }

src/test/ui/lint/unused/unused_attributes-must_use.stderr

@@ -45,7 +45,7 @@ error: `#[must_use]` has no effect when applied to a static item
 LL | #[must_use]
    | ^^^^^^^^^^^
 
-error: `#[must_use]` has no effect when applied to an item
+error: `#[must_use]` has no effect when applied to an implementation block
   --> $DIR/unused_attributes-must_use.rs:33:1
    |
 LL | #[must_use]
@@ -69,7 +69,7 @@ error: `#[must_use]` has no effect when applied to a type parameter
 LL | fn qux<#[must_use] T>(_: T) {}
    |        ^^^^^^^^^^^
 
-error: `#[must_use]` has no effect when applied to an item
+error: `#[must_use]` has no effect when applied to an implementation block
   --> $DIR/unused_attributes-must_use.rs:79:1
    |
 LL | #[must_use]

src/test/ui/rustdoc/check-doc-alias-attr-location.stderr

@@ -4,7 +4,7 @@ error: allow, cfg, cfg_attr, deny, expect, forbid, and warn are the only allowed
 LL |     fn foo(#[doc(alias = "qux")] _x: u32) -> Self::X {
    |            ^^^^^^^^^^^^^^^^^^^^^
 
-error: `#[doc(alias = "...")]` isn't allowed on extern block
+error: `#[doc(alias = "...")]` isn't allowed on foreign module
   --> $DIR/check-doc-alias-attr-location.rs:9:7
    |
 LL | #[doc(alias = "foo")]