fn wcpcpy(noalias dst: [*]wchar_t, noalias src: [*:0]const wchar_t) callconv(.c) [*]wchar_t
fn wcpcpy(noalias dst: [*]wchar_t, noalias src: [*:0]const wchar_t) callconv(.c) [*]wchar_t { const src_len = std.mem.len(src); @memcpy(dst[0 .. src_len + 1], src[0 .. src_len + 1]); return dst + src_len; }