syntax_data: {"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"#[label(mir_build_unused_unsafe_enclosing_block_label)]"}]}
source_snippet:     #[label(mir_build_unused_unsafe_enclosing_block_label)]
context_before: pub(crate) enum UnusedUnsafeEnclosing {
context_after:     Block {