syntax_data: {"ast_node_type":"other","tokens":[{"end":17,"kind":"keyword","start":0,"text":"("}]}
source_snippet:                 (
context_before:                 debug!("method_callee: user_ty={:?}", user_ty);
context_after:                     Ty::new_fn_def(self.tcx, def_id, self.typeck_results.node_args(expr.hir_id)),