no need to bootstrap

src/liballoc/lib.rs

@@ -85,7 +85,7 @@
 #![feature(const_generic_impls_guard)]
 #![feature(const_generics)]
 #![feature(const_in_array_repeat_expressions)]
-#![cfg_attr(not(bootstrap), feature(const_if_match))]
+#![feature(const_if_match)]
 #![feature(cow_is_borrowed)]
 #![feature(dispatch_from_dyn)]
 #![feature(core_intrinsics)]

src/liballoc/raw_vec.rs

@@ -52,14 +52,7 @@ impl<T, A: Alloc> RawVec<T, A> {
     /// Like `new`, but parameterized over the choice of allocator for
     /// the returned `RawVec`.
     pub const fn new_in(a: A) -> Self {
-        // FIXME(mark-i-m): remove bootstrapping cfgs these after a cycle
-        let cap = {
-            #[cfg(not(bootstrap))]
-            { if mem::size_of::<T>() == 0 { core::usize::MAX } else { 0 } }
-
-            #[cfg(bootstrap)]
-            [0, !0][(mem::size_of::<T>() == 0) as usize]
-        };
+        let cap = if mem::size_of::<T>() == 0 { core::usize::MAX } else { 0 };
 
         // `Unique::empty()` doubles as "unallocated" and "zero-sized allocation".
         RawVec {