In Java, the compiler complains about unreachable code and aborts. I think that's ridiculous. Sometimes it's useful to create unreachable code during development.

  int foo = doSomething();
  return 0;  // Debug XXX DONOTSUBMIT
  int bar = doSomethingElse();
  return foo + bar;

It's hilarious, though, that this workaround works:

  int foo = doSomething();
  if (1 > 0) return 0;  // Debug XXX DONOTSUBMIT
  int bar = doSomethingElse();
  return foo + bar;

Go's mandatory warnings are equally annoying. I'm sick and tired of little rarefied groups of language designers trying to impose their ideas about best practices on the rest of the world.