{"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"#[tracing::instrument(skip_all)]"}]}
    #[tracing::instrument(skip_all)]
    /// Unify two relatable values (e.g. `Ty`) and register new trait goals that arise from that.
    pub(crate) fn unify<T: ?Sized + Zip<Interner>>(&mut self, ty1: &T, ty2: &T) -> bool {