test/hello_world.wat

(module
 (type $i32_i32_=>_i32 (func (param i32 i32) (result i32)))
 (memory $0 256 256)
 (export "add" (func $add))
 (func $add (param $x i32) (param $y i32) (result i32)
  (i32.add
   (local.get $x)
   (local.get $y)
  )
 )
)