----
switch (x) {
 case 1:
 case 2: 
 case 3: foo()
 case 4: bar()
}

switch (x) {
 case 4: case 5: case 6: baz()
}
----
switch x
  when 1, 2, 3
    foo()
  when 4
    bar()
switch x
  when 4, 5, 6
    baz()