syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"self.in_scope(arm_scope,"}]}
source_snippet:                 self.in_scope(arm_scope, arm.lint_level, |this| {
context_before:                 let match_scope = self.local_scope();
context_after:                     let old_dedup_scope =