3 files changed, 10 insertions, 2 deletions

diff --git a/crates/ra_syntax/src/ast.rs b/crates/ra_syntax/src/ast.rs
index b92cc082e..165b308d1 100644
--- a/crates/ra_syntax/src/ast.rs
+++ b/crates/ra_syntax/src/ast.rs
@@ -431,6 +431,13 @@ impl StructDef {
 }
 
 impl EnumVariant {
+    pub fn parent_enum(&self) -> &EnumDef {
+        self.syntax()
+            .parent()
+            .and_then(|it| it.parent())
+            .and_then(EnumDef::cast)
+            .expect("EnumVariants are always nested in Enums")
+    }
     pub fn flavor(&self) -> StructFlavor {
         StructFlavor::from_node(self)
     }
diff --git a/crates/ra_syntax/src/ast/generated.rs b/crates/ra_syntax/src/ast/generated.rs
index e39b58827..bb223e0dc 100644
--- a/crates/ra_syntax/src/ast/generated.rs
+++ b/crates/ra_syntax/src/ast/generated.rs
@@ -3649,6 +3649,7 @@ impl ast::VisibilityOwner for TraitDef {}
 impl ast::NameOwner for TraitDef {}
 impl ast::AttrsOwner for TraitDef {}
 impl ast::DocCommentsOwner for TraitDef {}
+impl ast::TypeParamsOwner for TraitDef {}
 impl TraitDef {}
 
 // TrueKw
diff --git a/crates/ra_syntax/src/grammar.ron b/crates/ra_syntax/src/grammar.ron
index c5297e46d..dedefea59 100644
--- a/crates/ra_syntax/src/grammar.ron
+++ b/crates/ra_syntax/src/grammar.ron
@@ -280,7 +280,7 @@ Grammar(
         ], options: [["variant_list", "EnumVariantList"]] ),
         "EnumVariantList": ( collections: [["variants", "EnumVariant"]] ),
         "EnumVariant": ( traits: ["NameOwner", "DocCommentsOwner"], options: ["Expr"] ),
-        "TraitDef": ( traits: ["VisibilityOwner", "NameOwner", "AttrsOwner", "DocCommentsOwner"] ),
+        "TraitDef": ( traits: ["VisibilityOwner", "NameOwner", "AttrsOwner", "DocCommentsOwner", "TypeParamsOwner"] ),
         "Module": (
             traits: ["VisibilityOwner", "NameOwner", "AttrsOwner", "DocCommentsOwner" ],
             options: [ "ItemList" ]
@@ -489,7 +489,7 @@ Grammar(
         ),
 
         "RefPat": ( options: [ "Pat" ]),
-        "BindPat": ( 
+        "BindPat": (
             options: [ "Pat" ],
             traits: ["NameOwner"]
         ),