syntax_data: {"ast_node_type":"other","tokens":[{"end":33,"kind":"keyword","start":0,"text":"return"}]}
source_snippet:                 return Some(res);
context_before:             if let Some(res) = tcx.selection_cache.get(&(infcx.typing_env(param_env), pred), tcx) {
context_after:             } else if cfg!(debug_assertions) {