syntax_data: {"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"dropless_arena:"}]}
source_snippet:             dropless_arena: self.dropless_arena,
context_before:             module: self.tcx.parent_module(self.lint_level).to_def_id(),
context_after:             match_lint_level: self.lint_level,