syntax_data: {"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"local_decls:"}]}
source_snippet:         local_decls: &'a mut LocalDecls<'tcx>,
context_before:         tcx: TyCtxt<'tcx>,
context_after:         typing_env: TypingEnv<'tcx>,