Lower Fn(X, Y) -> Z paths

crates/ra_syntax/src/ast/generated.rs

@@ -2312,6 +2312,12 @@ impl PathSegment {
     pub fn type_arg_list(&self) -> Option<TypeArgList> {
         AstChildren::new(&self.syntax).next()
     }
+    pub fn param_list(&self) -> Option<ParamList> {
+        AstChildren::new(&self.syntax).next()
+    }
+    pub fn ret_type(&self) -> Option<RetType> {
+        AstChildren::new(&self.syntax).next()
+    }
 }
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct PathType {

crates/ra_syntax/src/grammar.ron

@@ -684,7 +684,7 @@ Grammar(
             ]
         ),
         "PathSegment": (
-            options: [ "NameRef", "TypeArgList" ]
+            options: [ "NameRef", "TypeArgList", "ParamList", "RetType" ]
         ),
         "TypeArgList": (collections: [
             ("type_args", "TypeArg"),