Error mapping in fuzz

[ionut-arm]

Hello!

I'm trying to setup fuzzing using the fuzz!(|param: Type| { ... }); template (where Type implements Arbitrary), however I keep getting an error from within the macro.

The failure points to the following snippet:

RingBuffer::new($buf, $buf.len())
           .and_then(|mut b| Arbitrary::arbitrary(&mut b).map_err(|_| ""))

Because the closure inside the and_then is supposed to return the same type as RingBuffer::new, the map_err makes my compiler grumpy since it returns &str instead of BufferError.

expected enum arbitrary::BufferError, found &str
help: try using a variant of the expected enum: Ok(Arbitrary :: arbitrary (& mut b) . map_err (| _ | ""))

My use case is pretty simple:

fuzz!(|key_name: String| { 
        let mut test_client = TestClient::new();
        if let Err(ResponseStatus::ConnectionError) = test_client.create_rsa_sign_key(key_name.clone()) {
            panic!("Died for input: {}", key_name);
        }
});

Not sure if this is because of me misunderstanding how the afl crate works or if this is a legit bug.

PS: I'm importing and using arbitrary: "0.2.0"

[adu-web3]

same problem