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It causes problems with Apple Clang version 9, apparently. I think this
compiler technically falls outside of our support window. However, an
actual user is having issues with it, and I think
ForbidsComposingWith
is adding only very marginal value anyway. I tried deleting it and the
error messages became a couple of lines shorter, although perhaps less
direct (no more reference to "explicitly deleted").
Amusingly, I'm keeping the unit test for it around, because it's one of
those unfortunate "uncomment to test" deals, and the tests will still
pass. (We'll get compiler errors for doing unsupported operations.)
Fixes #226.