syntax_data: {"ast_node_type":"variable","tokens":[{"end":39,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let overloaded_callee =
context_before:                 let call_def_id = deref.method_call(self.tcx);
context_after:                     Ty::new_fn_def(self.tcx, call_def_id, self.tcx.mk_args(&[expr.ty.into()]));