syntax_data: {"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"#[label(mir_build_value_borrowed_label)]"}]}
source_snippet:     #[label(mir_build_value_borrowed_label)]
context_before:     pub(crate) binding_span: Span,
context_after:     pub(crate) conflicts_ref: Vec<Span>,