{"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"//"}]}
        // `(X, Y)` and `OpaqueType<Y, X>` mapped to `(Y, X)`, and those are the same, but we
        // back to the opaque type definition. E.g. we may have `OpaqueType<X, Y>` mapped to
        // only know that once we convert the generic parameters to those of the opaque type.