Use .copied() instead of .cloned()

cranelift/isle/fuzz/fuzz_targets/compile.rs

@@ -0,0 +1,15 @@
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+
+fuzz_target!(|s: &str| {
+    let _ = env_logger::try_init();
+
+    let lexer = isle::lexer::Lexer::from_str(s, "fuzz-input.isle");
+    log::debug!("lexer = {:?}", lexer);
+
+    if let Ok(lexer) = lexer {
+        let defs = isle::parser::parse(lexer);
+        log::debug!("defs = {:?}", defs);
+    }
+});