syntax_data: {"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"safety_mode:"}]}
source_snippet:             safety_mode: match block.rules {
context_before:             expr: block.expr.map(|expr| self.mirror_expr(expr)),
context_after:                 hir::BlockCheckMode::DefaultBlock => BlockSafety::Safe,