completion for trait params

crates/libsyntax2/src/ast/generated.rs

@@ -698,6 +698,7 @@ impl<'a> AstNode<'a> for ItemList<'a> {
     fn syntax(self) -> SyntaxNodeRef<'a> { self.syntax }
 }
 
+impl<'a> ast::FnDefOwner<'a> for ItemList<'a> {}
 impl<'a> ItemList<'a> {
     pub fn items(self) -> impl Iterator<Item = ModuleItem<'a>> + 'a {
         super::children(self)

crates/libsyntax2/src/grammar.ron

@@ -275,6 +275,7 @@ Grammar(
             options: [ "ItemList" ]
         ),
         "ItemList": (
+            traits: [ "FnDefOwner" ],
             collections: [ ["items", "ModuleItem"] ]
         ),
         "ConstDef": ( traits: [