syntax_data: {"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:                     if arm.guard.is_some() { HasMatchGuard::Yes } else { HasMatchGuard::No };
context_before:                 let has_match_guard =
context_after:                 (&*arm.pattern, has_match_guard)