{"ast_node_type":"variable","tokens":[{"end":63,"kind":"keyword","start":0,"text":"let"}]}
        let environment = db.trait_environment(self.id.into());
    pub fn assoc_fn_params(self, db: &dyn HirDatabase) -> Vec<Param<'_>> {
        let substs = TyBuilder::placeholder_subst(db, self.id);