Introduce ListInput

fuzzers/structure_aware/baby_fuzzer_multi/src/main.rs

@@ -43,10 +43,10 @@ fn count_set(count: usize) {
 #[expect(clippy::manual_assert)]
 pub fn main() {
     // The closure that we want to fuzz
-    let mut harness = |input: &MultipartInput<BytesInput>| {
-        let mut count = input.parts().len();
-        for (i, input) in input.parts().iter().enumerate() {
-            let target = input.target_bytes();
+    let mut harness = |input: &MultipartInput<BytesInput, ()>| {
+        let mut count = input.len();
+        for (i, input) in input.iter().enumerate() {
+            let target = input.1.target_bytes();
             let buf = target.as_slice();
             signals_set(i * 8);
             if !buf.is_empty() && buf[0] == b'a' {
@@ -143,11 +143,11 @@ pub fn main() {
     .expect("Failed to create the Executor");
 
     // a generator here is not generalisable
-    let initial = MultipartInput::from([
-        ("part", BytesInput::new(vec![b'h', b'e', b'l', b'l', b'o'])),
-        ("part", BytesInput::new(vec![b'h', b'e', b'l', b'l', b'o'])),
-        ("part", BytesInput::new(vec![b'h', b'e', b'l', b'l', b'o'])),
-        ("part", BytesInput::new(vec![b'h', b'e', b'l', b'l', b'o'])),
+    let initial = MultipartInput::with_default_names([
+        BytesInput::new(vec![b'h', b'e', b'l', b'l', b'o']),
+        BytesInput::new(vec![b'h', b'e', b'l', b'l', b'o']),
+        BytesInput::new(vec![b'h', b'e', b'l', b'l', b'o']),
+        BytesInput::new(vec![b'h', b'e', b'l', b'l', b'o']),
     ]);
 
     fuzzer