https://github.com/akkartik/mu/blob/main/linux/bootstrap/031transforms.cc

     1 :(before "End Types")
     2 typedef void (*transform_fn)(program&);
     3 :(before "End Globals")
     4 vector<transform_fn> Transform;
     5
     6 :(before "End transform(program& p)")
     7 for (int t = 0;  t < SIZE(Transform);  ++t)
     8   (*Transform.at(t))(p);
     9
    10 :(before "End One-time Setup")
    11 // Begin Transforms
    12 // End Transforms