fn wmempcpy(noalias dest: [*]wchar_t, noalias src: [*]const wchar_t, len: usize) callconv(.c) [*]wchar_t
fn wmempcpy(noalias dest: [*]wchar_t, noalias src: [*]const wchar_t, len: usize) callconv(.c) [*]wchar_t { @memcpy(dest[0..len], src[0..len]); return dest + len; }