Fix fuzzer and bench build

crates/wasmparser/benches/benchmark.rs

@@ -218,6 +218,24 @@ fn read_all_wasm(wasm: &[u8]) -> Result<()> {
             | CustomSection { .. }
             | CodeSectionStart { .. }
             | End(_) => {}
+
+            other => {
+                // NB: if you hit this panic if you'd be so kind as to grep
+                // through other locations in the code base that need to be
+                // updated as well. As of the time of this writing the locations
+                // might be:
+                //
+                //  * src/bin/wasm-tools/objdump.rs
+                //  * src/bin/wasm-tools/dump.rs
+                //  * crates/wasm-encoder/src/reencode.rs
+                //  * crates/wasm-encoder/src/reencode/component.rs
+                //  * crates/wasmprinter/src/lib.rs
+                //  * crates/wit-component/src/gc.rs
+                //
+                // This is required due to the `#[non_exhaustive]` nature of
+                // the `Payload` enum.
+                panic!("a new match statement should be added above for this case: {other:?}")
+            }
         }
     }
     Ok(())

fuzz/src/validate.rs

@@ -102,6 +102,8 @@ fn validate_all(u: &mut Unstructured<'_>, mut validator: Validator, wasm: &[u8])
 
             // No associated range.
             End(_) => {}
+
+            _ => {}
         }
     }