ide: show go to for function hover return type

crates/ide/src/hover.rs

@@ -314,6 +314,7 @@ fn goto_type_action_for_def(db: &RootDatabase, def: Definition) -> Option<HoverA
             Definition::Local(it) => it.ty(db),
             Definition::GenericParam(hir::GenericParam::ConstParam(it)) => it.ty(db),
             Definition::Field(field) => field.ty(db),
+            Definition::Function(function) => function.ret_type(db),
             _ => return None,
         };
 

crates/ide/src/hover/tests.rs

@@ -1750,6 +1750,9 @@ fn foo_$0test() {}
                         cfg: None,
                     },
                 ),
+                GoToType(
+                    [],
+                ),
             ]
         "#]],
     );