fn wcscat(noalias dst: [*:0]wchar_t, noalias src: [*:0]const wchar_t) callconv(.c) [*:0]wchar_t
fn wcscat(noalias dst: [*:0]wchar_t, noalias src: [*:0]const wchar_t) callconv(.c) [*:0]wchar_t { return wcsncat(dst, src, std.math.maxInt(usize)); }