syntax_data: {"ast_node_type":"variable","tokens":[{"end":41,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let cause = ObligationCause::dummy();
context_before:     let (infcx, param_env) = tcx.infer_ctxt().build_with_typing_env(typing_env);
context_after:     match infcx.at(&cause, param_env).query_normalize(value) {