syntax_data: {"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"BlockSafety::BuiltinUnsafe"}]}
source_snippet:             BlockSafety::BuiltinUnsafe => {
context_before:             // an outer unsafe block
context_after:                 self.in_safety_context(SafetyContext::BuiltinUnsafeBlock, |this| {