{"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"#[instrument(level"}]}
    #[instrument(level = "trace", skip(self), ret)]
    /// and is able to name all other placeholder and inference variables.
    pub(super) fn term_is_fully_unconstrained(&self, goal: Goal<I, ty::NormalizesTo<I>>) -> bool {