syntax_data: {"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"dropless_arena:"}]}
source_snippet:             dropless_arena: &dropless_arena,
context_before:             typing_env: rustc_middle::ty::TypingEnv::non_body_analysis(self.tcx, self.def_id),
context_after:             match_lint_level: self.hir_id,