Do not allow unreachable patterns (often a logic issue)

src/lib.rs

@@ -12,6 +12,7 @@
 #![cfg_attr(feature = "clippy", allow(not_unsafe_ptr_arg_deref))]
 #![cfg_attr(feature = "clippy", allow(or_fun_call))]
 #![cfg_attr(feature = "clippy", allow(too_many_arguments))]
+#![deny(unreachable_patterns)]
 #![feature(alloc)]
 #![feature(allocator_api)]
 #![feature(asm)]