Rollup merge of #61364 - lzutao:stabilize-reverse_bits, r=Centril

Stabilize reverse_bits feature

FCP done in https://github.com/rust-lang/rust/issues/48763#issuecomment-497349379

Closes #48763

r? @Centril

src/libcore/lib.rs

@@ -120,7 +120,6 @@
 #![feature(const_str_len)]
 #![feature(const_int_conversion)]
 #![feature(const_transmute)]
-#![feature(reverse_bits)]
 #![feature(non_exhaustive)]
 #![feature(structural_match)]
 #![feature(abi_unadjusted)]

src/libcore/num/mod.rs

@@ -463,15 +463,12 @@ assert_eq!(m, ", $swapped, ");
 Basic usage:
 
 ```
-#![feature(reverse_bits)]
-
 let n = ", $swap_op, stringify!($SelfT), ";
 let m = n.reverse_bits();
 
 assert_eq!(m, ", $reversed, ");
 ```"),
-            #[unstable(feature = "reverse_bits", issue = "48763")]
-            #[rustc_const_unstable(feature = "const_int_conversion")]
+            #[stable(feature = "reverse_bits", since = "1.37.0")]
             #[inline]
             #[must_use]
             pub const fn reverse_bits(self) -> Self {
@@ -2514,14 +2511,12 @@ assert_eq!(m, ", $swapped, ");
 Basic usage:
 
 ```
-#![feature(reverse_bits)]
-
 let n = ", $swap_op, stringify!($SelfT), ";
 let m = n.reverse_bits();
 
 assert_eq!(m, ", $reversed, ");
 ```"),
-            #[unstable(feature = "reverse_bits", issue = "48763")]
+            #[stable(feature = "reverse_bits", since = "1.37.0")]
             #[inline]
             #[must_use]
             pub const fn reverse_bits(self) -> Self {

src/libcore/num/wrapping.rs

@@ -511,7 +511,6 @@ assert_eq!(n.trailing_zeros(), 3);
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(reverse_bits)]
             /// use std::num::Wrapping;
             ///
             /// let n = Wrapping(0b0000000_01010101i16);
@@ -522,7 +521,7 @@ assert_eq!(n.trailing_zeros(), 3);
             /// assert_eq!(m.0 as u16, 0b10101010_00000000);
             /// assert_eq!(m, Wrapping(-22016));
             /// ```
-            #[unstable(feature = "reverse_bits", issue = "48763")]
+            #[stable(feature = "reverse_bits", since = "1.37.0")]
             #[inline]
             #[must_use]
             pub const fn reverse_bits(self) -> Self {

src/libcore/tests/lib.rs

@@ -24,7 +24,6 @@
 #![feature(test)]
 #![feature(trusted_len)]
 #![feature(try_trait)]
-#![feature(reverse_bits)]
 #![feature(inner_deref)]
 #![feature(slice_internals)]
 #![feature(slice_partition_dedup)]

src/librustc_mir/lib.rs

@@ -22,7 +22,6 @@ Rust MIR: a lowered representation of Rust. Also: an experiment!
 #![feature(unicode_internals)]
 #![feature(step_trait)]
 #![feature(slice_concat_ext)]
-#![feature(reverse_bits)]
 #![feature(try_blocks)]
 
 #![recursion_limit="256"]

src/test/run-pass/const-int-conversion.rs

@@ -1,4 +1,4 @@
-#![feature(const_int_conversion, reverse_bits)]
+#![feature(const_int_conversion)]
 
 const REVERSE: u32 = 0x12345678_u32.reverse_bits();
 const FROM_BE_BYTES: i32 = i32::from_be_bytes([0x12, 0x34, 0x56, 0x78]);

src/test/ui/consts/const-int-conversion.rs

@@ -1,5 +1,3 @@
-#![feature(reverse_bits)]
-
 fn main() {
     let x: &'static i32 = &(5_i32.reverse_bits());
         //~^ ERROR temporary value dropped while borrowed

src/test/ui/consts/const-int-conversion.stderr

@@ -1,5 +1,5 @@
 error[E0716]: temporary value dropped while borrowed
-  --> $DIR/const-int-conversion.rs:4:28
+  --> $DIR/const-int-conversion.rs:2:28
    |
 LL |     let x: &'static i32 = &(5_i32.reverse_bits());
    |            ------------    ^^^^^^^^^^^^^^^^^^^^^^ creates a temporary which is freed while still in use
@@ -10,7 +10,7 @@ LL | }
    | - temporary value is freed at the end of this statement
 
 error[E0716]: temporary value dropped while borrowed
-  --> $DIR/const-int-conversion.rs:6:28
+  --> $DIR/const-int-conversion.rs:4:28
    |
 LL |     let y: &'static i32 = &(i32::from_be_bytes([0x12, 0x34, 0x56, 0x78]));
    |            ------------    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ creates a temporary which is freed while still in use
@@ -21,7 +21,7 @@ LL | }
    | - temporary value is freed at the end of this statement
 
 error[E0716]: temporary value dropped while borrowed
-  --> $DIR/const-int-conversion.rs:8:28
+  --> $DIR/const-int-conversion.rs:6:28
    |
 LL |     let z: &'static i32 = &(i32::from_le_bytes([0x12, 0x34, 0x56, 0x78]));
    |            ------------    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ creates a temporary which is freed while still in use
@@ -32,7 +32,7 @@ LL | }
    | - temporary value is freed at the end of this statement
 
 error[E0716]: temporary value dropped while borrowed
-  --> $DIR/const-int-conversion.rs:10:28
+  --> $DIR/const-int-conversion.rs:8:28
    |
 LL |     let a: &'static i32 = &(i32::from_be(i32::from_ne_bytes([0x80, 0, 0, 0])));
    |            ------------    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ creates a temporary which is freed while still in use
@@ -43,7 +43,7 @@ LL | }
    | - temporary value is freed at the end of this statement
 
 error[E0716]: temporary value dropped while borrowed
-  --> $DIR/const-int-conversion.rs:12:29
+  --> $DIR/const-int-conversion.rs:10:29
    |
 LL |     let b: &'static [u8] = &(0x12_34_56_78_i32.to_be_bytes());
    |            -------------    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ creates a temporary which is freed while still in use
@@ -54,7 +54,7 @@ LL | }
    | - temporary value is freed at the end of this statement
 
 error[E0716]: temporary value dropped while borrowed
-  --> $DIR/const-int-conversion.rs:14:29
+  --> $DIR/const-int-conversion.rs:12:29
    |
 LL |     let c: &'static [u8] = &(0x12_34_56_78_i32.to_le_bytes());
    |            -------------    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ creates a temporary which is freed while still in use
@@ -65,7 +65,7 @@ LL | }
    | - temporary value is freed at the end of this statement
 
 error[E0716]: temporary value dropped while borrowed
-  --> $DIR/const-int-conversion.rs:16:29
+  --> $DIR/const-int-conversion.rs:14:29
    |
 LL |     let d: &'static [u8] = &(i32::min_value().to_be().to_ne_bytes());
    |            -------------    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ creates a temporary which is freed while still in use