add warning about fuzzing being enabled

secp256k1-sys/src/lib.rs

@@ -26,6 +26,9 @@
 #[cfg(any(test, feature = "std"))]
 extern crate core;
 
+#[cfg(rust_secp_fuzz)]
+const THIS_UNUSED_CONSTANT_IS_YOUR_WARNING_THAT_ALL_THE_CRYPTO_IN_THIS_LIB_IS_DISABLED_FOR_FUZZING: usize = 0;
+
 #[macro_use]
 mod macros;
 pub mod types;