syntax_data: {"ast_node_type":"variable","tokens":[{"end":43,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let Normalized { value, obligations } =
context_before:     let ParamEnvAnd { param_env, value: Normalize { value } } = key;
context_after:         ocx.infcx.at(&ObligationCause::dummy(), param_env).query_normalize(value)?;