test/wasm2js/sign_ext.wast


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(module
  (func "test8" (param $x i32) (result i32)
    (i32.extend8_s (local.get $x))
  )
  (func "test16" (param $x i32) (result i32)
    (i32.extend16_s (local.get $x))
  )
)