syntax_data: {"ast_node_type":"other","tokens":[{"end":32,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) -> CostChecker<'b, 'tcx> {
context_before:         callee_body: &'b Body<'tcx>,
context_after:         CostChecker { tcx, typing_env, callee_body, instance, penalty: 0, bonus: 0 }