Update arbitrary crate to 0.4

Author: PaulGrandperrin

Cargo.toml

@@ -25,7 +25,7 @@ travis-ci = { repository = "rust-fuzz/honggfuzz-rs", branch = "master" }
 maintenance = { status = "actively-developed" }
 
 [dependencies]
-arbitrary = "0.2"
+arbitrary = "0.4"
 
 [dev-dependencies]
 rand = "0.6"

src/lib.rs

@@ -370,14 +370,11 @@ macro_rules! fuzz {
     (|$buf:ident: $dty:ty| $body:block) => {
         honggfuzz::fuzz(|$buf| {
             let $buf: $dty = {
-                use $crate::arbitrary::{Arbitrary, RingBuffer};
+                use $crate::arbitrary::{Arbitrary, Unstructured};
 
-                if let Ok(mut buf) = RingBuffer::new($buf, $buf.len()) {
-                    if let Ok(buf) = Arbitrary::arbitrary(&mut buf) {
-                        buf
-                    } else {
-                        return
-                    }
+                let mut buf = Unstructured::new($buf); 
+                if let Ok(buf) = Arbitrary::arbitrary(&mut buf) {
+                    buf
                 } else {
                     return
                 }