syntax_data: {"ast_node_type":"other","tokens":[{"end":37,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) -> PredicateObligations<'tcx> {
context_before:         args: GenericArgsRef<'tcx>,
context_after:         // PERF: `Sized`'s predicates include `MetaSized`, but both are compiler implemented marker