syntax_data: {"ast_node_type":"other","tokens":[{"end":12,"kind":"keyword","start":0,"text":"#[label]"}]}
source_snippet:     #[label]
context_before: pub(crate) struct UnsafeOpInUnsafeFnCallToUnsafeFunctionRequiresUnsafe {
context_after:     pub(crate) span: Span,