syntax_data: {"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"Ty::new_fn_def(self.tcx,"}]}
source_snippet:                     Ty::new_fn_def(self.tcx, call_def_id, self.tcx.mk_args(&[expr.ty.into()]));
context_before:                 let overloaded_callee =