Fails to build with gdc-12

[baryluk]

When building hunt-skeleton example

$ DC=gdc-12 dub run -v

../.dub/packages/hunt-extra-1.2.3/hunt-extra/source/hunt/collection/Radix.d:49:28: error: returning ‘cast(char*)(&this + 8L)’ escapes a reference to parameter ‘this’ [-Werror=deprecated]
   49 |         return cast(char*)(&this + 1);
      |                            ^
../.dub/packages/hunt-extra-1.2.3/hunt-extra/source/hunt/collection/Radix.d:49:28: note: perhaps annotate the function with ‘return’
   49 |         return cast(char*)(&this + 1);

[Heromyth]

We'll have a test for this.