Bug 22546 – bad diagnostic for CTFE array cast of string in UDA

I was messing around with weird combinations of string literals and found this oddity: ``` enum a = cast(dstring) "what"c; @(cast(dstring) "huh"c) int x; ``` The first line gives: Error: array cast from `string` to `dstring` is not supported at compile time Makes sense, but the second line: /dlang/dmd/linux/bin64/../../src/druntime/import/core/memory.d(1023): Error: `fakePureErrno` cannot be interpreted at compile time, because it has no available source code When adding one more character to the string, it gets a bit more sensible again: /dlang/dmd/linux/bin64/../../src/druntime/import/core/internal/array/casting.d(90): Error: reinterpreting cast from `string` to `Array*` is not supported in CTFE onlineapp.d(2): called from here: `__ArrayCast("huha"c)` Not encountered in any actual code, so filing as a minor issue.

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