syntax_data: {"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let parent = cx.tcx.hir_get_parent_item(hir_id);
context_before:         let (infcx, param_env) = cx.tcx.infer_ctxt().build_with_typing_env(cx.typing_env);