pub label_break_value: Lock<Vec<Span>>,
/// Spans collected for gating `box_syntax`, e.g. `box $expr`.
pub box_syntax: Lock<Vec<Span>>,
pub label_break_value: Lock<Vec<Span>>,
/// Spans collected for gating `box_syntax`, e.g. `box $expr`.
pub box_syntax: Lock<Vec<Span>>,