Auto merge of #28468 - nagisa:revert-negate-unsigned-warning, r=alexcrichton

This reverts commit 0ca8e4994e.

Fixes #27141

src/test/bench/shootout-mandelbrot.rs

@@ -192,7 +192,7 @@ fn write_line(init_i: f64, vec_init_r: &[f64], res: &mut Vec<u8>) {
             i += 2;
         }
 
-        res.push(cur_byte^-1);
+        res.push(cur_byte^!0);
     }
 }
 

src/test/compile-fail/feature-gate-negate-unsigned.rs

@@ -18,21 +18,21 @@ impl std::ops::Neg for S {
 }
 
 const _MAX: usize = -1;
-//~^ WARN unary negation of unsigned integers will be feature gated in the future
+//~^ ERROR unary negation of unsigned integers may be removed in the future
 
 fn main() {
     let a = -1;
-    //~^ WARN unary negation of unsigned integers will be feature gated in the future
+    //~^ ERROR unary negation of unsigned integers may be removed in the future
     let _b : u8 = a; // for infering variable a to u8.
 
     -a;
-    //~^ WARN unary negation of unsigned integers will be feature gated in the future
+    //~^ ERROR unary negation of unsigned integers may be removed in the future
 
     let _d = -1u8;
-    //~^ WARN unary negation of unsigned integers will be feature gated in the future
+    //~^ ERROR unary negation of unsigned integers may be removed in the future
 
     for _ in -10..10u8 {}
-    //~^ WARN unary negation of unsigned integers will be feature gated in the future
+    //~^ ERROR unary negation of unsigned integers may be removed in the future
 
     -S; // should not trigger the gate; issue 26840
 }

src/test/run-pass/unary-minus-suffix-inference.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![feature(negate_unsigned)]
+
 pub fn main() {
     let a = 1;
     let a_neg: i8 = -a;