Address comments: fix docs, add completion test for Self.

crates/ra_hir/src/code_model.rs

@@ -465,7 +465,7 @@ impl Enum {
         // ...and add generic params, if present
         let p = self.generic_params(db);
         let r = if !p.params.is_empty() { r.push_generic_params_scope(p) } else { r };
-        r.push_scope(Scope::AdtScope(From::from(self)))
+        r.push_scope(Scope::AdtScope(self.into()))
     }
 }
 

crates/ra_hir/src/resolve.rs

@@ -45,7 +45,7 @@ pub(crate) enum Scope {
     GenericParams(Arc<GenericParams>),
     /// Brings `Self` in `impl` block into scope
     ImplBlockScope(ImplBlock),
-    /// Brings `Self` in enum definition into scope
+    /// Brings `Self` in enum, struct and union definitions into scope
     AdtScope(Adt),
     /// Local bindings
     ExprScope(ExprScope),

crates/ra_hir/src/ty/infer.rs

@@ -559,9 +559,7 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
             match resolver.resolve_path_in_type_ns_fully(self.db, &path) {
                 Some(TypeNs::Adt(Adt::Struct(it))) => it.into(),
                 Some(TypeNs::Adt(Adt::Union(it))) => it.into(),
-                Some(TypeNs::AdtSelfType(Adt::Struct(it))) => it.into(),
+                Some(TypeNs::AdtSelfType(adt)) => adt.into(),
-                Some(TypeNs::AdtSelfType(Adt::Union(it))) => it.into(),
-                Some(TypeNs::AdtSelfType(Adt::Enum(it))) => it.into(),
                 Some(TypeNs::EnumVariant(it)) => it.into(),
                 Some(TypeNs::TypeAlias(it)) => it.into(),
 

crates/ra_ide_api/src/completion/complete_scope.rs

@@ -309,6 +309,35 @@ mod tests {
         );
     }
 
+    #[test]
+    fn completes_self_in_enum() {
+        assert_debug_snapshot!(
+            do_reference_completion(
+                r"
+                enum X {
+                    Y(<|>)
+                }
+                "
+            ),
+            @r###"[
+    CompletionItem {
+        label: "Self",
+        source_range: [48; 48),
+        delete: [48; 48),
+        insert: "Self",
+        kind: TypeParam,
+    },
+    CompletionItem {
+        label: "X",
+        source_range: [48; 48),
+        delete: [48; 48),
+        insert: "X",
+        kind: Enum,
+    },
+]"###
+        );
+    }
+
     #[test]
     fn completes_module_items() {
         assert_debug_snapshot!(