test/wasm2js/br_table_to_loop.wast

(module
 (func $exp1 (export "exp1")
  (block $block
   ;; An infinite loop. When optimizing, wasm2js enables ignore-implicit-traps
   ;; and so it can simplify this.
   (loop $loop
    (br_table $block $loop $block (i32.const 1))
   )
  )
 )
 (func $exp2 (export "exp2")
  (block $block
   ;; A loop that never executes. This can be optimized into a nop.
   (loop $loop
    (br_table $loop $block $loop (i32.const 1))
   )
  )
 )
)