Update fuzz crate

Following the instructions from the fuzzing book the fuzz crate has been
recreated.
Putting the second parse and the assert on different lines gives better
panic messages because it makes it easier to distinguish whether the
unwrapping or the assert failed.

url/fuzz/Cargo.toml

@@ -1,9 +1,10 @@
 
 [package]
 name = "url-fuzz"
-version = "0.0.1"
+version = "0.0.0"
 authors = ["Automatically generated"]
 publish = false
+edition = "2018"
 
 [package.metadata]
 cargo-fuzz = true
@@ -14,9 +15,12 @@ libfuzzer-sys = "0.3"
 [dependencies.url]
 path = ".."
 
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
 [[bin]]
 name = "parse"
 path = "fuzz_targets/parse.rs"
-
-[workspace]
-members = ["."]
+test = false
+doc = false

url/fuzz/fuzz_targets/parse.rs

@@ -1,13 +1,10 @@
 #![no_main]
-#[macro_use] extern crate libfuzzer_sys;
-extern crate url;
-use std::str;
+use libfuzzer_sys::fuzz_target;
 
-fuzz_target!(|data: &[u8]| {
-    if let Ok(utf8) = str::from_utf8(data) {
-        if let Ok(parsed) = url::Url::parse(utf8) {
-            let as_str = parsed.as_str();
-            assert_eq!(parsed, url::Url::parse(as_str).unwrap());
-        }
+fuzz_target!(|data: String| {
+    if let Ok(parsed) = url::Url::parse(data.as_str()) {
+        let as_str = parsed.as_str();
+        let parsed_again = url::Url::parse(as_str).unwrap();
+        assert_eq!(parsed, parsed_again);
     }
 });