fluent-bit/lib/wasm-micro-runtime-WAMR-1.2.2/samples/wasm-c-api/src/callback.wat


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(module
  (func $print (import "" "print") (param i32) (result i32))
  (func $closure (import "" "closure") (result i32))
  (func (export "run") (param $x i32) (param $y i32) (result i32)
    (i32.add
      (call $print (i32.add (local.get $x) (local.get $y)))
      (call $closure)
    )
  )
)