syntax_data: {"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"typeck_results:"}]}
source_snippet:     typeck_results: &'a ty::TypeckResults<'tcx>,
context_before:     typing_env: ty::TypingEnv<'tcx>,
context_after:     pat: &'tcx hir::Pat<'tcx>,