{"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"#[instrument(level"}]}
    #[instrument(level = "debug", skip(self, relation))]
    /// See `tests/ui/const-generics/occurs-check/` for more examples where this is relevant.
    pub(crate) fn instantiate_const_var<R: PredicateEmittingRelation<InferCtxt<'tcx>>>(