AFAICT, release 2.074.0 has regressed move semantics in function return statements.

As a consequence, my package

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

no longer compiles.

At master branch, `dub build` now errors as


Performing "debug" build using /usr/bin/dmd for x86_64.
gmp-d 0.0.1+commit.126.g660d82b: building configuration "library"...
src/gmp/z.d(484,20): Error: struct gmp.z.MpZ is not copyable because it is annotated with @disable
src/gmp/q.d(205,16): Error: template instance gmp.z.MpZ.opBinary!"/" error instantiating
src/gmp/z.d(168,16): Error: struct gmp.z.MpZ is not copyable because it is annotated with @disable
src/gmp/z.d(921,16): Error: struct gmp.z.MpZ is not copyable because it is annotated with @disable
/usr/bin/dmd failed with exit code 1.


which means that the return statement at

https://github.com/nordlow/gmp-d/blob/660d82b99abeef2b26ef3c9c4525d08a2aafdc55/src/gmp/z.d#L484

can no longer move the expression `y`.

I don't understand why this specific case fails when others in the standard library apparently hasn't.

Help, please.

On Saturday, 22 April 2017 at 11:54:12 UTC, Nordlöw wrote:
> which means that the return statement at
>
> https://github.com/nordlow/gmp-d/blob/660d82b99abeef2b26ef3c9c4525d08a2aafdc55/src/gmp/z.d#L484
>
> can no longer move the expression `y`.

Note that changing the line 484 containing

    return y;

to

    return move(y);

instead fails as

/usr/include/dmd/phobos/std/algorithm/mutation.d(1207,12): Error: struct gmp.z.MpZ is not copyable because it is annotated with @disable
/usr/include/dmd/phobos/std/algorithm/mutation.d(1200,20): Error: template instance std.algorithm.mutation.moveImpl!(MpZ) error instantiating
/usr/include/dmd/phobos/std/algorithm/mutation.d(1162,31):        instantiated from here: trustedMoveImpl!(MpZ)
src/gmp/z.d(484,24):        instantiated from here: move!(MpZ)
src/gmp/q.d(205,16):        instantiated from here: opBinary!"/"
src/gmp/z.d(168,16): Error: struct gmp.z.MpZ is not copyable because it is annotated with @disable
src/gmp/z.d(921,16): Error: struct gmp.z.MpZ is not copyable because it is annotated with @disable

On Saturday, 22 April 2017 at 11:54:12 UTC, Nordlöw wrote:
> can no longer move the expression `y`.
>
> I don't understand why this specific case fails when others in the standard library apparently hasn't.
>
> Help, please.

Please file a regression at issues.dlang.org and prefix the subject with "[Reg 2.074.0]".