Fix udt

Fixes Bodo's thing

module udt;
export all;

external typedef secret;

typedef secret[3] boom;

typedef int[2] pair;

secret foo (secret x)
{
   return x;
}


#if 1
secret[*] foo (secret[*] x)
{
   return [x,x];
}

pair foo (pair x)
{
    return x;
}

pair[.,.] foo (pair[.] x)
{
    return [x,x];
}
#endif

Macro implementation was missing. No idea why that starts showing up now though, probably triggered by a different bug.