{"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"///"}]}
    /// is true for its `i32` argument. In the `*mut T` case, the
    /// `Contravariant.xform(Covariant)` or `Contravariant`. The same
    /// variance of `Vec<i32>` is `Contravariant.xform(Invariant)`,