syntax_data: {"ast_node_type":"other","tokens":[{"end":40,"kind":"keyword","start":0,"text":"typing_env:"}]}
source_snippet:         typing_env: ty::TypingEnv<'tcx>,
context_before:         local_decls: &'a mut LocalDecls<'tcx>,
context_after:         excluded_pointees: &'a [Ty<'tcx>],