Auto merge of #50629 - Mark-Simulacrum:stage-step, r=alexcrichton

Switch to bootstrapping from 1.27

It's possible the Float trait could be removed from core, but I couldn't tell whether it was intended to be removed or not. @SimonSapin may be able to comment more here; we can presumably also do that in a follow up PR as this one is already quite large.

1 files changed, 2 insertions, 11 deletions

diff --git a/src/liballoc/slice.rs b/src/liballoc/slice.rs
index 6caf12aa7eb..4427ac004f9 100644
--- a/src/liballoc/slice.rs
+++ b/src/liballoc/slice.rs
@@ -101,7 +101,6 @@ use core::cmp::Ordering::{self, Less};
 use core::mem::size_of;
 use core::mem;
 use core::ptr;
-#[cfg(stage0)] use core::slice::SliceExt;
 use core::{u8, u16, u32};
 
 use borrow::{Borrow, BorrowMut, ToOwned};
@@ -171,13 +170,9 @@ mod hack {
     }
 }
 
-#[cfg_attr(stage0, lang = "slice")]
-#[cfg_attr(not(stage0), lang = "slice_alloc")]
+#[lang = "slice_alloc"]
 #[cfg(not(test))]
 impl<T> [T] {
-    #[cfg(stage0)]
-    slice_core_methods!();
-
     /// Sorts the slice.
     ///
     /// This sort is stable (i.e. does not reorder equal elements) and `O(n log n)` worst-case.
@@ -467,8 +462,7 @@ impl<T> [T] {
     }
 }
 
-#[cfg_attr(stage0, lang = "slice_u8")]
-#[cfg_attr(not(stage0), lang = "slice_u8_alloc")]
+#[lang = "slice_u8_alloc"]
 #[cfg(not(test))]
 impl [u8] {
     /// Returns a vector containing a copy of this slice where each byte
@@ -504,9 +498,6 @@ impl [u8] {
         me.make_ascii_lowercase();
         me
     }
-
-    #[cfg(stage0)]
-    slice_u8_core_methods!();
 }
 
 ////////////////////////////////////////////////////////////////////////////////