Step bootstrap cfgs

example/mini_core.rs

@@ -420,7 +420,6 @@ pub fn panic(_msg: &'static str) -> ! {
 
 macro_rules! panic_const {
     ($($lang:ident = $message:expr,)+) => {
-        #[cfg(not(bootstrap))]
         pub mod panic_const {
             use super::*;
 

src/lib.rs

@@ -23,7 +23,6 @@
     trusted_len,
     hash_raw_entry
 )]
-#![cfg_attr(bootstrap, feature(associated_type_bounds))]
 #![allow(broken_intra_doc_links)]
 #![recursion_limit = "256"]
 #![warn(rust_2018_idioms)]