Reports function calls with the Deferred result type if the return value is not used.

If the Deferred return value is not used, the call site would not wait to complete this function.

Example:


  fun calcEverythingAsync() = CompletableDeferred(42)

  fun usage() {
      calcEverythingAsync()
  }

calcEverythingAsync() call here is never used and not awaited for with await(), which is suspicious.