{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"//"}]}
                // try to evaluate unevaluated const. Replace with new var if const eval failed.
                crate::ConstScalar::Unknown => self.new_const_var(data.ty.clone()),
                crate::ConstScalar::UnevaluatedConst(id, subst) => {