syntax_data: {"ast_node_type":"variable","tokens":[{"end":100,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let placeholder_self_ty = self.infcx.shallow_resolve(placeholder_trait_predicate.self_ty());
context_before:             self.infcx.enter_forall_and_leak_universe(obligation.predicate).trait_ref;
context_after:         let candidate_predicate = self