{"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"span:"}]}
        span: <Self::Interner as Interner>::Span,
        goal: Goal<Self::Interner, <Self::Interner as Interner>::Predicate>,
        stalled_on: Option<GoalStalledOn<Self::Interner>>,