syntax_data: {"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"nested.push(obligation.with("}]}
source_snippet:                 nested.push(obligation.with(
context_before:                 let placeholder_output_ty = self.infcx.enter_forall_and_leak_universe(sig.output());
context_after:                     tcx,