memcpy "discards qualifiers" warning

[AnnaKornfeldSimpson]

For the following example, the compiler gives a "discards qualifiers" warning on src:

array_ptr<const uint8_t> src = ...;
array_ptr<uint8_t> dst = ...;
memcpy<uint8_t>(dst, src, size);

The warning:

warning: passing '_Array_ptr<const uint8_t>'  to parameter of type '_Array_ptr<uint8_t>' discards
      qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
        memcpy<uint8_t>(tmp, (_Array_ptr<const uint8_t>)srcData, srcDataSize);
                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/lib/clang/6.0.0/include/string_checked.h:65:36: note: passing argument to parameter 'src'
      here
             const void * restrict src : itype(restrict _Array_ptr<const T>) byte_count(n),
                                   ^
1 warning generated.

Why is this warning occurring? There's definitely a const T right there in the listing of src.

Occurs on Linux, built from master this evening.

[dtarditi]

PR #581 revamped the implementation of generic functions extensively. This issue no longer seems to appear.

[AnnaKornfeldSimpson]

I also can no longer repro this; thanks!