switch (a) {
  case 1: 
    if (a) { break; }
    else { break; }
}
// result
switch (a) {
  case 1:
    if (a) break;
    break;
}

switch (a) {
  case 1: 
    if (a) { return; }
    else { return; }
}
// result
switch (a) {
  case 1: a; return;
}

if (a) {
  return;
} else {
  return
}
// result
a; return;

// there are 2 optimizations that take place here, first, else is dropped and after that first `if break` is inlined into `test` of loop
while (a) { 
  if (a) {
    break;
  } else {
    break
  }
}
// result
for (; a && !a;) break;