syntax_data: {"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"body:"}]}
source_snippet:             body: self.mirror_expr(arm.body),
context_before:             guard: arm.guard.as_ref().map(|g| self.mirror_expr(g)),
context_after:             lint_level: LintLevel::Explicit(arm.hir_id),