syntax_data: {"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) -> Result<ty::GenericArg<'tcx>, NoSolution> {
context_before:         arg: ty::GenericArg<'tcx>,
context_after:         let input = self.typing_env.as_query_input(arg);