Sema: allow @ptrCast slice of zero-bit type to slice of non-zero-bit type
#23418
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…t type This is actually completely well-defined. The resulting slice always has 0 elements. The only disallowed case is casting *to* a slice of a zero-bit type, because in that case, you cna't figure out how many destination elements to use (and there's *no* valid destination length if the source slice corresponds to more than 0 bits).
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This is actually completely well-defined. The resulting slice always has 0 elements. The only disallowed case is casting to a slice of a zero-bit type, because in that case, you cna't figure out how many destination elements to use (and there's no valid destination length if the source slice corresponds to more than 0 bits).