syntax_data: {"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":".at(&obligation.cause,"}]}
source_snippet:                 .at(&obligation.cause, obligation.param_env)
context_before:             self.infcx
context_after:                 .eq(DefineOpaqueTypes::No, trait_predicate.trait_ref, upcast_trait_ref)