Remove stabilized features

Author: phil-opp

src/lib.rs

@@ -4,9 +4,6 @@
 #![cfg_attr(feature = "unstable", feature(slice_ptr_get))]
 #![cfg_attr(feature = "unstable", feature(slice_ptr_len))]
 #![cfg_attr(feature = "very_unstable", feature(const_slice_ptr_len))]
-#![cfg_attr(feature = "very_unstable", feature(const_panic))]
-#![cfg_attr(feature = "very_unstable", feature(const_fn_trait_bound))]
-#![cfg_attr(feature = "very_unstable", feature(const_fn_fn_ptr_basics))]
 #![cfg_attr(feature = "very_unstable", feature(const_trait_impl))]
 #![cfg_attr(feature = "very_unstable", feature(const_mut_refs))]
 #![cfg_attr(feature = "very_unstable", allow(incomplete_features))]