syntax_data: {"ast_node_type":"variable","tokens":[{"end":76,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                         let trait_ref = self.infcx.resolve_vars_if_possible(
context_before:                     if !candidate_set.ambiguous && no_candidates_apply {
context_after:                             stack.obligation.predicate.skip_binder().trait_ref,