Fix fuzz tests

.gitignore

@@ -2,3 +2,4 @@
 Cargo.lock
 .directory
 Notes.md
+fuzz/coverage

fuzz/README.md

@@ -0,0 +1,13 @@
+# How to run fuzz tests
+
+1. Install [cargo-fuzz](https://github.com/rust-fuzz/cargo-fuzz)
+
+    ```sh
+    cargo install cargo-fuzz
+    ```
+
+2. Run a fuzzing target and find bugs! (needs nighly toolchain)
+
+    ```sh
+    cargo +nightly fuzz run fuzz_target_1`
+    ```

fuzz/fuzz_targets/fuzz_target_1.rs

@@ -1,14 +1,14 @@
 #![no_main]
 extern crate winnow;
+use flatzinc::Stmt;
 use libfuzzer_sys::fuzz_target;
-pub use winnow::error::ContextError;
 
 fuzz_target!(|data: &[u8]| {
     // fuzzed code goes here
-    if let Ok(mut utf8_str) = std::str::from_utf8(data) {
-        match flatzinc::statement::<ContextError>(&mut utf8_str) {
-            Ok(result) => println!("{:#?}", result),
-            Err(e) => print!("Failed to parse flatzinc: {:?}", e),
+    if let Ok(utf8_str) = std::str::from_utf8(data) {
+        match <Stmt as std::str::FromStr>::from_str(utf8_str) {
+            Ok(result) => println!("{}\n{:#?}", utf8_str, result),
+            Err(_) => print!(" Failed to parse test data."),
         }
     } else {
         // print!("No valid utf8!")