fix lib tests

Author: bend-n

library/alloc/tests/fmt.rs

@@ -1,6 +1,7 @@
 #![deny(warnings)]
 // FIXME(static_mut_refs): Do not allow `static_mut_refs` lint
-#![allow(static_mut_refs, redundant_transmutation)]
+#![allow(static_mut_refs)]
+#![cfg_attr(not(bootstrap), allow(redundant_transmutation))]
 
 use std::cell::RefCell;
 use std::fmt::{self, Write};

library/core/src/intrinsics/mod.rs

@@ -1354,6 +1354,7 @@ pub const fn forget<T: ?Sized>(_: T);
 /// Turning raw bytes (`[u8; SZ]`) into `u32`, `f64`, etc.:
 ///
 /// ```
+/// # #![cfg_attr(not(bootstrap), allow(redundant_transmutation))]
 /// let raw_bytes = [0x78, 0x56, 0x34, 0x12];
 ///
 /// let num = unsafe {