The file https://github.com/nordlow/gmp-d/blob/master/src/gmp/z.d

in my

https://github.com/nordlow/gmp-d

package errors during compilation with DMD Git master as

z.d(2350,16): Error: struct gmp.z.MpZ is not copyable because it is annotated with @disable

Specifically, this happens in the return statement in the compile-time call of eval() during in the `static assert` here:


/// `MpZ`-`MpZ` adding expression.
struct MpzAddExpr(T1, T2)
    if (isMpZExpr!T1 &&
        isMpZExpr!T2)
{
    T1 e1;                      // first term
    T2 e2;                      // second term
    pragma(inline, true)
    MpZ eval() const @trusted
    {
        typeof(return) y = null;
        __gmpz_add(y._ptr, e1.eval()._ptr, e2.eval()._ptr); version(ccc) ++y._ccc;
        return y;
    }
}
version(unittest) static assert(isMpZExpr!(MpzAddExpr!(MpZ, MpZ)));


It seems like CTFE no longer allows the `Mpz`-instance to be moved in the `return` statement of `eval()`.

This doesn't happen with 2.073.1.