(module
 (type $none_=>_none (func))
 (func $contrast
  (local $x i32)
  (local $y i32)
  (local $z i32)
  (local $a i32)
  (local $b i32)
  (local.set $x
   (i32.const 1)
  )
  (if
   (local.get $x)
   (nop)
  )
  (if
   (local.get $x)
   (nop)
  )
  (nop)
  (drop
   (if (result i32)
    (i32.const 2)
    (i32.const 3)
    (i32.const 4)
   )
  )
  (nop)
  (drop
   (block $block (result i32)
    (i32.const 5)
   )
  )
  (nop)
  (drop
   (if (result i32)
    (i32.const 6)
    (block (result i32)
     (nop)
     (i32.const 7)
    )
    (block (result i32)
     (nop)
     (i32.const 8)
    )
   )
  )
  (nop)
  (drop
   (block $val (result i32)
    (if
     (i32.const 10)
     (block $block4
      (nop)
      (br $val
       (i32.const 11)
      )
     )
    )
    (nop)
    (i32.const 12)
   )
  )
 )
)