Update tests

src/test/compile-fail/issue-52443.rs

@@ -1,11 +1,11 @@
 fn main() {
     [(); & { loop { continue } } ]; //~ ERROR mismatched types
-    //~^ ERROR `loop` is not allowed in a `const`
+
     [(); loop { break }]; //~ ERROR mismatched types
-    //~^ ERROR `loop` is not allowed in a `const`
+
     [(); {while true {break}; 0}];
-    //~^ ERROR `while` is not allowed in a `const`
-    //~| WARN denote infinite loops with
+    //~^ WARN denote infinite loops with
+
     [(); { for _ in 0usize.. {}; 0}];
     //~^ ERROR `for` is not allowed in a `const`
     //~| ERROR calls in constants are limited to constant functions

src/test/ui/async-await/issue-70594.rs

@@ -4,7 +4,6 @@ async fn fun() {
     [1; ().await];
     //~^ error: `await` is only allowed inside `async` functions and blocks
     //~| error: `.await` is not allowed in a `const`
-    //~| error: `loop` is not allowed in a `const`
     //~| error: `.await` is not allowed in a `const`
     //~| error: `()` is not a future
 }

src/test/ui/async-await/issue-70594.stderr

@@ -12,15 +12,6 @@ error[E0744]: `.await` is not allowed in a `const`
 LL |     [1; ().await];
    |         ^^^^^^^^
 
-error[E0658]: `loop` is not allowed in a `const`
-  --> $DIR/issue-70594.rs:4:9
-   |
-LL |     [1; ().await];
-   |         ^^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
 error[E0744]: `.await` is not allowed in a `const`
   --> $DIR/issue-70594.rs:4:9
    |
@@ -36,7 +27,7 @@ LL |     [1; ().await];
    = help: the trait `std::future::Future` is not implemented for `()`
    = note: required by `std::future::Future::poll`
 
-error: aborting due to 5 previous errors
+error: aborting due to 4 previous errors
 
-Some errors have detailed explanations: E0277, E0658, E0728, E0744.
+Some errors have detailed explanations: E0277, E0728, E0744.
 For more information about an error, try `rustc --explain E0277`.

src/test/ui/closures/issue-52437.rs

@@ -1,7 +1,6 @@
 fn main() {
     [(); &(&'static: loop { |x| {}; }) as *const _ as usize]
     //~^ ERROR: invalid label name `'static`
-    //~| ERROR: `loop` is not allowed in a `const`
     //~| ERROR: type annotations needed
     //~| ERROR mismatched types
 }

src/test/ui/closures/issue-52437.stderr

@@ -4,15 +4,6 @@ error: invalid label name `'static`
 LL |     [(); &(&'static: loop { |x| {}; }) as *const _ as usize]
    |             ^^^^^^^
 
-error[E0658]: `loop` is not allowed in a `const`
-  --> $DIR/issue-52437.rs:2:13
-   |
-LL |     [(); &(&'static: loop { |x| {}; }) as *const _ as usize]
-   |             ^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
 error[E0282]: type annotations needed
   --> $DIR/issue-52437.rs:2:30
    |
@@ -27,7 +18,7 @@ LL | fn main() {
 LL |     [(); &(&'static: loop { |x| {}; }) as *const _ as usize]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found array `[(); _]`
 
-error: aborting due to 4 previous errors
+error: aborting due to 3 previous errors
 
-Some errors have detailed explanations: E0282, E0308, E0658.
+Some errors have detailed explanations: E0282, E0308.
 For more information about an error, try `rustc --explain E0282`.

src/test/ui/consts/const-eval/infinite_loop.rs

@@ -4,7 +4,6 @@ fn main() {
     let _ = [(); {
         let mut n = 113383; // #20 in https://oeis.org/A006884
         while n != 0 {
-        //~^ ERROR `while` is not allowed in a `const`
             n = if n % 2 == 0 { n/2 } else { 3*n + 1 };
             //~^ ERROR evaluation of constant value failed
         }

src/test/ui/consts/const-eval/infinite_loop.stderr

@@ -1,23 +1,9 @@
-error[E0658]: `while` is not allowed in a `const`
-  --> $DIR/infinite_loop.rs:6:9
-   |
-LL | /         while n != 0 {
-LL | |
-LL | |             n = if n % 2 == 0 { n/2 } else { 3*n + 1 };
-LL | |
-LL | |         }
-   | |_________^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
 error[E0080]: evaluation of constant value failed
-  --> $DIR/infinite_loop.rs:8:17
+  --> $DIR/infinite_loop.rs:7:17
    |
 LL |             n = if n % 2 == 0 { n/2 } else { 3*n + 1 };
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ exceeded interpreter step limit (see `#[const_eval_limit]`)
 
-error: aborting due to 2 previous errors
+error: aborting due to previous error
 
-Some errors have detailed explanations: E0080, E0658.
-For more information about an error, try `rustc --explain E0080`.
+For more information about this error, try `rustc --explain E0080`.

src/test/ui/consts/const-eval/issue-52442.rs

@@ -1,6 +1,5 @@
 fn main() {
     [();  { &loop { break } as *const _ as usize } ];
-    //~^ ERROR `loop` is not allowed in a `const`
-    //~| ERROR casting pointers to integers in constants is unstable
+    //~^ ERROR casting pointers to integers in constants is unstable
     //~| ERROR evaluation of constant value failed
 }

src/test/ui/consts/const-eval/issue-52442.stderr

@@ -1,12 +1,3 @@
-error[E0658]: `loop` is not allowed in a `const`
-  --> $DIR/issue-52442.rs:2:14
-   |
-LL |     [();  { &loop { break } as *const _ as usize } ];
-   |              ^^^^^^^^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
 error[E0658]: casting pointers to integers in constants is unstable
   --> $DIR/issue-52442.rs:2:13
    |
@@ -22,7 +13,7 @@ error[E0080]: evaluation of constant value failed
 LL |     [();  { &loop { break } as *const _ as usize } ];
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ "pointer-to-integer cast" needs an rfc before being allowed inside constants
 
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors
 
 Some errors have detailed explanations: E0080, E0658.
 For more information about an error, try `rustc --explain E0080`.

src/test/ui/consts/const-eval/issue-52475.rs

@@ -3,7 +3,6 @@ fn main() {
         let mut x = &0;
         let mut n = 0;
         while n < 5 {
-        //~^ ERROR `while` is not allowed in a `const`
             n = (n + 1) % 5; //~ ERROR evaluation of constant value failed
             x = &0; // Materialize a new AllocId
         }

src/test/ui/consts/const-eval/issue-52475.stderr

@@ -1,23 +1,9 @@
-error[E0658]: `while` is not allowed in a `const`
-  --> $DIR/issue-52475.rs:5:9
-   |
-LL | /         while n < 5 {
-LL | |
-LL | |             n = (n + 1) % 5;
-LL | |             x = &0; // Materialize a new AllocId
-LL | |         }
-   | |_________^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
 error[E0080]: evaluation of constant value failed
-  --> $DIR/issue-52475.rs:7:17
+  --> $DIR/issue-52475.rs:6:17
    |
 LL |             n = (n + 1) % 5;
    |                 ^^^^^^^^^^^ exceeded interpreter step limit (see `#[const_eval_limit]`)
 
-error: aborting due to 2 previous errors
+error: aborting due to previous error
 
-Some errors have detailed explanations: E0080, E0658.
-For more information about an error, try `rustc --explain E0080`.
+For more information about this error, try `rustc --explain E0080`.

src/test/ui/consts/const-eval/issue-62272.rs

@@ -1,11 +0,0 @@
-// `loop`s unconditionally-broken-from used to be allowed in constants, but are now forbidden by
-// the HIR const-checker.
-//
-// See https://github.com/rust-lang/rust/pull/66170 and
-// https://github.com/rust-lang/rust/issues/62272.
-
-const FOO: () = loop { break; }; //~ ERROR `loop` is not allowed in a `const`
-
-fn main() {
-    [FOO; { let x; loop { x = 5; break; } x }]; //~ ERROR `loop` is not allowed in a `const`
-}

src/test/ui/consts/const-eval/issue-62272.stderr

@@ -1,21 +0,0 @@
-error[E0658]: `loop` is not allowed in a `const`
-  --> $DIR/issue-62272.rs:7:17
-   |
-LL | const FOO: () = loop { break; };
-   |                 ^^^^^^^^^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
-error[E0658]: `loop` is not allowed in a `const`
-  --> $DIR/issue-62272.rs:10:20
-   |
-LL |     [FOO; { let x; loop { x = 5; break; } x }];
-   |                    ^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
-error: aborting due to 2 previous errors
-
-For more information about this error, try `rustc --explain E0658`.

src/test/ui/consts/const-eval/issue-70723.rs

@@ -1,5 +1,3 @@
-#![feature(const_loop)]
-
 static _X: () = loop {}; //~ ERROR could not evaluate static initializer
 
 fn main() {}

src/test/ui/consts/const-eval/issue-70723.stderr

@@ -1,5 +1,5 @@
 error[E0080]: could not evaluate static initializer
-  --> $DIR/issue-70723.rs:3:17
+  --> $DIR/issue-70723.rs:1:17
    |
 LL | static _X: () = loop {};
    |                 ^^^^^^^ exceeded interpreter step limit (see `#[const_eval_limit]`)

src/test/ui/consts/const-eval/livedrop.rs

@@ -1,6 +1,3 @@
-#![feature(const_if_match)]
-#![feature(const_loop)]
-
 const _: Option<Vec<i32>> = {
     let mut never_returned = Some(Vec::new());
     let mut always_returned = None; //~ ERROR destructors cannot be evaluated at compile-time

src/test/ui/consts/const-eval/livedrop.stderr

@@ -1,5 +1,5 @@
 error[E0493]: destructors cannot be evaluated at compile-time
-  --> $DIR/livedrop.rs:6:9
+  --> $DIR/livedrop.rs:3:9
    |
 LL |     let mut always_returned = None;
    |         ^^^^^^^^^^^^^^^^^^^ constants cannot evaluate destructors

src/test/ui/consts/const-labeled-break.rs

@@ -1,12 +1,11 @@
+// run-pass
+
 // Using labeled break in a while loop has caused an illegal instruction being
 // generated, and an ICE later.
 //
 // See https://github.com/rust-lang/rust/issues/51350 for more information.
-//
-// It is now forbidden by the HIR const-checker.
-//
-// See https://github.com/rust-lang/rust/pull/66170.
 
-const CRASH: () = 'a: while break 'a {}; //~ ERROR `while` is not allowed in a `const`
+#[allow(unreachable_code)]
+const _: () = 'a: while break 'a {};
 
 fn main() {}

src/test/ui/consts/const-labeled-break.stderr

@@ -1,12 +0,0 @@
-error[E0658]: `while` is not allowed in a `const`
-  --> $DIR/const-labeled-break.rs:10:19
-   |
-LL | const CRASH: () = 'a: while break 'a {};
-   |                   ^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
-error: aborting due to previous error
-
-For more information about this error, try `rustc --explain E0658`.

src/test/ui/consts/const_limit/const_eval_limit_not_reached.rs

@@ -1,7 +1,6 @@
 // check-pass
 
 #![feature(const_eval_limit)]
-#![feature(const_loop)]
 
 // This needs to be higher than the number of loop iterations since each pass through the loop may
 // hit more than one terminator.

src/test/ui/consts/const_limit/const_eval_limit_reached.rs

@@ -1,5 +1,4 @@
 #![feature(const_eval_limit)]
-#![feature(const_loop)]
 #![const_eval_limit = "500"]
 
 const X: usize = {

src/test/ui/consts/const_limit/const_eval_limit_reached.stderr

@@ -1,5 +1,5 @@
 error: any use of this value will cause an error
-  --> $DIR/const_eval_limit_reached.rs:7:11
+  --> $DIR/const_eval_limit_reached.rs:6:5
    |
 LL |  / const X: usize = {
 LL |  |     let mut x = 0;

src/test/ui/consts/control-flow/basics.rs

@@ -3,7 +3,6 @@
 // run-pass
 
 #![feature(const_panic)]
-#![feature(const_loop)]
 #![feature(const_fn)]
 
 const X: u32 = 4;

src/test/ui/consts/control-flow/drop-fail.precise.stderr

@@ -1,11 +1,11 @@
 error[E0493]: destructors cannot be evaluated at compile-time
-  --> $DIR/drop-fail.rs:9:9
+  --> $DIR/drop-fail.rs:8:9
    |
 LL |     let x = Some(Vec::new());
    |         ^ constants cannot evaluate destructors
 
 error[E0493]: destructors cannot be evaluated at compile-time
-  --> $DIR/drop-fail.rs:40:9
+  --> $DIR/drop-fail.rs:39:9
    |
 LL |     let mut tmp = None;
    |         ^^^^^^^ constants cannot evaluate destructors

src/test/ui/consts/control-flow/drop-fail.rs

@@ -1,6 +1,5 @@
 // revisions: stock precise
 
-#![feature(const_loop)]
 #![cfg_attr(precise, feature(const_precise_live_drops))]
 
 // `x` is *not* always moved into the final value and may be dropped inside the initializer.

src/test/ui/consts/control-flow/drop-fail.stock.stderr

@@ -1,5 +1,5 @@
 error[E0493]: destructors cannot be evaluated at compile-time
-  --> $DIR/drop-fail.rs:9:9
+  --> $DIR/drop-fail.rs:8:9
    |
 LL |     let x = Some(Vec::new());
    |         ^ constants cannot evaluate destructors
@@ -8,7 +8,7 @@ LL | };
    | - value is dropped here
 
 error[E0493]: destructors cannot be evaluated at compile-time
-  --> $DIR/drop-fail.rs:22:9
+  --> $DIR/drop-fail.rs:21:9
    |
 LL |     let vec_tuple = (Vec::new(),);
    |         ^^^^^^^^^ constants cannot evaluate destructors
@@ -17,7 +17,7 @@ LL | };
    | - value is dropped here
 
 error[E0493]: destructors cannot be evaluated at compile-time
-  --> $DIR/drop-fail.rs:30:9
+  --> $DIR/drop-fail.rs:29:9
    |
 LL |     let x: Result<_, Vec<i32>> = Ok(Vec::new());
    |         ^ constants cannot evaluate destructors
@@ -26,7 +26,7 @@ LL | };
    | - value is dropped here
 
 error[E0493]: destructors cannot be evaluated at compile-time
-  --> $DIR/drop-fail.rs:40:9
+  --> $DIR/drop-fail.rs:39:9
    |
 LL |     let mut tmp = None;
    |         ^^^^^^^ constants cannot evaluate destructors

src/test/ui/consts/control-flow/drop-pass.rs

@@ -1,7 +1,6 @@
 // run-pass
 // revisions: stock precise
 
-#![feature(const_loop)]
 #![cfg_attr(precise, feature(const_precise_live_drops))]
 
 // `x` is always moved into the final value and is not dropped inside the initializer.

src/test/ui/consts/control-flow/drop-precise.rs

@@ -1,7 +1,6 @@
 // run-pass
 // gate-test-const_precise_live_drops
 
-#![feature(const_loop)]
 #![feature(const_precise_live_drops)]
 
 const _: Vec<i32> = {

src/test/ui/consts/control-flow/interior-mutability.rs

@@ -1,8 +1,6 @@
 // Ensure that *any* assignment to the return place of a value with interior mutability
 // disqualifies it from promotion.
 
-#![feature(const_loop)]
-
 use std::cell::Cell;
 
 const X: Option<Cell<i32>> = {

src/test/ui/consts/control-flow/interior-mutability.stderr

@@ -1,5 +1,5 @@
 error[E0716]: temporary value dropped while borrowed
-  --> $DIR/interior-mutability.rs:42:26
+  --> $DIR/interior-mutability.rs:40:26
    |
 LL |     let x: &'static _ = &X;
    |            ----------    ^ 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/interior-mutability.rs:43:26
+  --> $DIR/interior-mutability.rs:41:26
    |
 LL |     let y: &'static _ = &Y;
    |            ----------    ^ 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/interior-mutability.rs:44:26
+  --> $DIR/interior-mutability.rs:42:26
    |
 LL |     let z: &'static _ = &Z;
    |            ----------    ^ creates a temporary which is freed while still in use

src/test/ui/consts/control-flow/loop.rs

@@ -1,29 +1,22 @@
-// Ensure that loops are forbidden in a const context unless `#![feature(const_loop)]` is enabled.
+const _: () = loop { break (); };
 
-// gate-test-const_loop
-// revisions: stock loop_
-
-#![cfg_attr(loop_, feature(const_loop))]
-
-const _: () = loop {}; //[stock]~ ERROR `loop` is not allowed in a `const`
-
-static FOO: i32 = loop { break 4; }; //[stock]~ ERROR `loop` is not allowed in a `static`
+static FOO: i32 = loop { break 4; };
 
 const fn foo() {
-    loop {} //[stock]~ ERROR `loop` is not allowed in a `const fn`
+    loop {}
 }
 
 pub trait Foo {
-    const BAR: i32 = loop { break 4; }; //[stock]~ ERROR `loop` is not allowed in a `const`
+    const BAR: i32 = loop { break 4; };
 }
 
 impl Foo for () {
-    const BAR: i32 = loop { break 4; }; //[stock]~ ERROR `loop` is not allowed in a `const`
+    const BAR: i32 = loop { break 4; };
 }
 
 fn non_const_outside() {
     const fn const_inside() {
-        loop {} //[stock]~ ERROR `loop` is not allowed in a `const fn`
+        loop {}
     }
 }
 
@@ -36,7 +29,6 @@ const fn const_outside() {
 fn main() {
     let x = [0; {
         while false {}
-        //[stock]~^ ERROR `while` is not allowed in a `const`
         4
     }];
 }
@@ -44,11 +36,11 @@ fn main() {
 const _: i32 = {
     let mut x = 0;
 
-    while x < 4 { //[stock]~ ERROR `while` is not allowed in a `const`
+    while x < 4 {
         x += 1;
     }
 
-    while x < 8 { //[stock]~ ERROR `while` is not allowed in a `const`
+    while x < 8 {
         x += 1;
     }
 
@@ -58,11 +50,11 @@ const _: i32 = {
 const _: i32 = {
     let mut x = 0;
 
-    for i in 0..4 { //[stock,loop_]~ ERROR `for` is not allowed in a `const`
+    for i in 0..4 { //~ ERROR `for` is not allowed in a `const`
         x += i;
     }
 
-    for i in 0..4 { //[stock,loop_]~ ERROR `for` is not allowed in a `const`
+    for i in 0..4 { //~ ERROR `for` is not allowed in a `const`
         x += i;
     }
 
@@ -72,14 +64,14 @@ const _: i32 = {
 const _: i32 = {
     let mut x = 0;
 
-    loop { //[stock]~ ERROR `loop` is not allowed in a `const`
+    loop {
         x += 1;
         if x == 4 {
             break;
         }
     }
 
-    loop { //[stock]~ ERROR `loop` is not allowed in a `const`
+    loop {
         x += 1;
         if x == 8 {
             break;
@@ -91,7 +83,7 @@ const _: i32 = {
 
 const _: i32 = {
     let mut x = 0;
-    while let None = Some(x) { } //[stock]~ ERROR `while` is not allowed in a `const`
-    while let None = Some(x) { } //[stock]~ ERROR `while` is not allowed in a `const`
+    while let None = Some(x) { }
+    while let None = Some(x) { }
     x
 };

src/test/ui/consts/control-flow/loop.stderr

@@ -1,5 +1,5 @@
 error[E0744]: `for` is not allowed in a `const`
-  --> $DIR/loop.rs:61:5
+  --> $DIR/loop.rs:53:5
    |
 LL | /     for i in 0..4 {
 LL | |         x += i;
@@ -7,7 +7,7 @@ LL | |     }
    | |_____^
 
 error[E0744]: `for` is not allowed in a `const`
-  --> $DIR/loop.rs:65:5
+  --> $DIR/loop.rs:57:5
    |
 LL | /     for i in 0..4 {
 LL | |         x += i;

src/test/ui/consts/control-flow/loop.stock.stderr

@@ -1,151 +0,0 @@
-error[E0658]: `loop` is not allowed in a `const`
-  --> $DIR/loop.rs:8:15
-   |
-LL | const _: () = loop {};
-   |               ^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
-error[E0658]: `loop` is not allowed in a `static`
-  --> $DIR/loop.rs:10:19
-   |
-LL | static FOO: i32 = loop { break 4; };
-   |                   ^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
-error[E0658]: `loop` is not allowed in a `const fn`
-  --> $DIR/loop.rs:13:5
-   |
-LL |     loop {}
-   |     ^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
-error[E0658]: `loop` is not allowed in a `const fn`
-  --> $DIR/loop.rs:26:9
-   |
-LL |         loop {}
-   |         ^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
-error[E0658]: `while` is not allowed in a `const`
-  --> $DIR/loop.rs:38:9
-   |
-LL |         while false {}
-   |         ^^^^^^^^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
-error[E0658]: `while` is not allowed in a `const`
-  --> $DIR/loop.rs:47:5
-   |
-LL | /     while x < 4 {
-LL | |         x += 1;
-LL | |     }
-   | |_____^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
-error[E0658]: `while` is not allowed in a `const`
-  --> $DIR/loop.rs:51:5
-   |
-LL | /     while x < 8 {
-LL | |         x += 1;
-LL | |     }
-   | |_____^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
-error[E0744]: `for` is not allowed in a `const`
-  --> $DIR/loop.rs:61:5
-   |
-LL | /     for i in 0..4 {
-LL | |         x += i;
-LL | |     }
-   | |_____^
-
-error[E0744]: `for` is not allowed in a `const`
-  --> $DIR/loop.rs:65:5
-   |
-LL | /     for i in 0..4 {
-LL | |         x += i;
-LL | |     }
-   | |_____^
-
-error[E0658]: `loop` is not allowed in a `const`
-  --> $DIR/loop.rs:75:5
-   |
-LL | /     loop {
-LL | |         x += 1;
-LL | |         if x == 4 {
-LL | |             break;
-LL | |         }
-LL | |     }
-   | |_____^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
-error[E0658]: `loop` is not allowed in a `const`
-  --> $DIR/loop.rs:82:5
-   |
-LL | /     loop {
-LL | |         x += 1;
-LL | |         if x == 8 {
-LL | |             break;
-LL | |         }
-LL | |     }
-   | |_____^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
-error[E0658]: `while` is not allowed in a `const`
-  --> $DIR/loop.rs:94:5
-   |
-LL |     while let None = Some(x) { }
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
-error[E0658]: `while` is not allowed in a `const`
-  --> $DIR/loop.rs:95:5
-   |
-LL |     while let None = Some(x) { }
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
-error[E0658]: `loop` is not allowed in a `const`
-  --> $DIR/loop.rs:17:22
-   |
-LL |     const BAR: i32 = loop { break 4; };
-   |                      ^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
-error[E0658]: `loop` is not allowed in a `const`
-  --> $DIR/loop.rs:21:22
-   |
-LL |     const BAR: i32 = loop { break 4; };
-   |                      ^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
-error: aborting due to 15 previous errors
-
-Some errors have detailed explanations: E0658, E0744.
-For more information about an error, try `rustc --explain E0658`.

src/test/ui/consts/min_const_fn/loop_ice.rs

@@ -1,5 +0,0 @@
-const fn foo() {
-    loop {} //~ ERROR `loop` is not allowed in a `const fn`
-}
-
-fn main() {}

src/test/ui/consts/min_const_fn/loop_ice.stderr

@@ -1,12 +0,0 @@
-error[E0658]: `loop` is not allowed in a `const fn`
-  --> $DIR/loop_ice.rs:2:5
-   |
-LL |     loop {}
-   |     ^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
-error: aborting due to previous error
-
-For more information about this error, try `rustc --explain E0658`.

src/test/ui/internal/internal-unstable-const.rs

@@ -1,12 +1,14 @@
+// Don't allow unstable features in stable functions without `allow_internal_unstable`.
+
 #![stable(feature = "rust1", since = "1.0.0")]
 
 #![feature(staged_api)]
-#![feature(const_loop, const_fn)]
+#![feature(const_transmute, const_fn)]
 
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_const_stable(feature = "rust1", since = "1.0.0")]
-const fn foo() -> i32 {
-    loop { return 42; } //~ ERROR `loop` is not allowed in a `const fn`
+pub const fn foo() -> i32 {
+    unsafe { std::mem::transmute(4u32) } //~ ERROR is not stable as `const fn`
 }
 
 fn main() {}

src/test/ui/internal/internal-unstable-const.stderr

@@ -1,9 +1,12 @@
-error[E0744]: `loop` is not allowed in a `const fn`
-  --> $DIR/internal-unstable-const.rs:9:5
+error[E0723]: can only call other `const fn` within a `const fn`, but `const std::intrinsics::transmute::<u32, i32>` is not stable as `const fn`
+  --> $DIR/internal-unstable-const.rs:11:14
    |
-LL |     loop { return 42; }
-   |     ^^^^^^^^^^^^^^^^^^^
+LL |     unsafe { std::mem::transmute(4u32) }
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #57563 <https://github.com/rust-lang/rust/issues/57563> for more information
+   = help: add `#![feature(const_fn)]` to the crate attributes to enable
 
 error: aborting due to previous error
 
-For more information about this error, try `rustc --explain E0744`.
+For more information about this error, try `rustc --explain E0723`.

src/test/ui/issues/issue-51714.rs

@@ -10,5 +10,4 @@ fn main() {
 
     [(); return while let Some(n) = Some(0) {}];
     //~^ ERROR return statement outside of function body
-    //~| ERROR `while` is not allowed in a `const`
 }

src/test/ui/issues/issue-51714.stderr

@@ -1,12 +1,3 @@
-error[E0658]: `while` is not allowed in a `const`
-  --> $DIR/issue-51714.rs:11:17
-   |
-LL |     [(); return while let Some(n) = Some(0) {}];
-   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
-
 error[E0572]: return statement outside of function body
   --> $DIR/issue-51714.rs:2:14
    |
@@ -31,7 +22,6 @@ error[E0572]: return statement outside of function body
 LL |     [(); return while let Some(n) = Some(0) {}];
    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 5 previous errors
+error: aborting due to 4 previous errors
 
-Some errors have detailed explanations: E0572, E0658.
-For more information about an error, try `rustc --explain E0572`.
+For more information about this error, try `rustc --explain E0572`.

src/test/ui/rfc-2632-const-trait-impl/hir-const-check.rs

@@ -4,12 +4,13 @@
 #![allow(incomplete_features)]
 
 pub trait MyTrait {
-    fn method(&self);
+    fn method(&self) -> Option<()>;
 }
 
 impl const MyTrait for () {
-    fn method(&self) {
-        loop {} //~ ERROR `loop` is not allowed in a `const fn`
+    fn method(&self) -> Option<()> {
+        Some(())?; //~ ERROR `?` is not allowed in a `const fn`
+        None
     }
 }
 

src/test/ui/rfc-2632-const-trait-impl/hir-const-check.stderr

@@ -1,12 +1,9 @@
-error[E0658]: `loop` is not allowed in a `const fn`
+error[E0744]: `?` is not allowed in a `const fn`
   --> $DIR/hir-const-check.rs:12:9
    |
-LL |         loop {}
-   |         ^^^^^^^
-   |
-   = note: see issue #52000 <https://github.com/rust-lang/rust/issues/52000> for more information
-   = help: add `#![feature(const_loop)]` to the crate attributes to enable
+LL |         Some(())?;
+   |         ^^^^^^^^^
 
 error: aborting due to previous error
 
-For more information about this error, try `rustc --explain E0658`.
+For more information about this error, try `rustc --explain E0744`.

src/tools/clippy/tests/ui/redundant_pattern_matching.fixed

@@ -1,7 +1,5 @@
 // run-rustfix
 
-#![feature(const_if_match)]
-#![feature(const_loop)]
 #![warn(clippy::all)]
 #![warn(clippy::redundant_pattern_matching)]
 #![allow(clippy::unit_arg, unused_must_use, clippy::needless_bool, deprecated)]

src/tools/clippy/tests/ui/redundant_pattern_matching.rs

@@ -1,7 +1,5 @@
 // run-rustfix
 
-#![feature(const_if_match)]
-#![feature(const_loop)]
 #![warn(clippy::all)]
 #![warn(clippy::redundant_pattern_matching)]
 #![allow(clippy::unit_arg, unused_must_use, clippy::needless_bool, deprecated)]

src/tools/clippy/tests/ui/redundant_pattern_matching.stderr

@@ -1,5 +1,5 @@
 error: redundant pattern matching, consider using `is_ok()`
-  --> $DIR/redundant_pattern_matching.rs:10:12
+  --> $DIR/redundant_pattern_matching.rs:8:12
    |
 LL |     if let Ok(_) = Ok::<i32, i32>(42) {}
    |     -------^^^^^--------------------- help: try this: `if Ok::<i32, i32>(42).is_ok()`
@@ -7,67 +7,67 @@ LL |     if let Ok(_) = Ok::<i32, i32>(42) {}
    = note: `-D clippy::redundant-pattern-matching` implied by `-D warnings`
 
 error: redundant pattern matching, consider using `is_err()`
-  --> $DIR/redundant_pattern_matching.rs:12:12
+  --> $DIR/redundant_pattern_matching.rs:10:12
    |
 LL |     if let Err(_) = Err::<i32, i32>(42) {}
    |     -------^^^^^^---------------------- help: try this: `if Err::<i32, i32>(42).is_err()`
 
 error: redundant pattern matching, consider using `is_none()`
-  --> $DIR/redundant_pattern_matching.rs:14:12
+  --> $DIR/redundant_pattern_matching.rs:12:12
    |
 LL |     if let None = None::<()> {}
    |     -------^^^^------------- help: try this: `if None::<()>.is_none()`
 
 error: redundant pattern matching, consider using `is_some()`
-  --> $DIR/redundant_pattern_matching.rs:16:12
+  --> $DIR/redundant_pattern_matching.rs:14:12
    |
 LL |     if let Some(_) = Some(42) {}
    |     -------^^^^^^^----------- help: try this: `if Some(42).is_some()`
 
 error: redundant pattern matching, consider using `is_some()`
-  --> $DIR/redundant_pattern_matching.rs:18:12
+  --> $DIR/redundant_pattern_matching.rs:16:12
    |
 LL |     if let Some(_) = Some(42) {
    |     -------^^^^^^^----------- help: try this: `if Some(42).is_some()`
 
 error: redundant pattern matching, consider using `is_some()`
-  --> $DIR/redundant_pattern_matching.rs:24:15
+  --> $DIR/redundant_pattern_matching.rs:22:15
    |
 LL |     while let Some(_) = Some(42) {}
    |     ----------^^^^^^^----------- help: try this: `while Some(42).is_some()`
 
 error: redundant pattern matching, consider using `is_none()`
-  --> $DIR/redundant_pattern_matching.rs:26:15
+  --> $DIR/redundant_pattern_matching.rs:24:15
    |
 LL |     while let None = Some(42) {}
    |     ----------^^^^----------- help: try this: `while Some(42).is_none()`
 
 error: redundant pattern matching, consider using `is_none()`
-  --> $DIR/redundant_pattern_matching.rs:28:15
+  --> $DIR/redundant_pattern_matching.rs:26:15
    |
 LL |     while let None = None::<()> {}
    |     ----------^^^^------------- help: try this: `while None::<()>.is_none()`
 
 error: redundant pattern matching, consider using `is_ok()`
-  --> $DIR/redundant_pattern_matching.rs:30:15
+  --> $DIR/redundant_pattern_matching.rs:28:15
    |
 LL |     while let Ok(_) = Ok::<i32, i32>(10) {}
    |     ----------^^^^^--------------------- help: try this: `while Ok::<i32, i32>(10).is_ok()`
 
 error: redundant pattern matching, consider using `is_err()`
-  --> $DIR/redundant_pattern_matching.rs:32:15
+  --> $DIR/redundant_pattern_matching.rs:30:15
    |
 LL |     while let Err(_) = Ok::<i32, i32>(10) {}
    |     ----------^^^^^^--------------------- help: try this: `while Ok::<i32, i32>(10).is_err()`
 
 error: redundant pattern matching, consider using `is_some()`
-  --> $DIR/redundant_pattern_matching.rs:35:15
+  --> $DIR/redundant_pattern_matching.rs:33:15
    |
 LL |     while let Some(_) = v.pop() {
    |     ----------^^^^^^^---------- help: try this: `while v.pop().is_some()`
 
 error: redundant pattern matching, consider using `is_ok()`
-  --> $DIR/redundant_pattern_matching.rs:51:5
+  --> $DIR/redundant_pattern_matching.rs:49:5
    |
 LL | /     match Ok::<i32, i32>(42) {
 LL | |         Ok(_) => true,
@@ -76,7 +76,7 @@ LL | |     };
    | |_____^ help: try this: `Ok::<i32, i32>(42).is_ok()`
 
 error: redundant pattern matching, consider using `is_err()`
-  --> $DIR/redundant_pattern_matching.rs:56:5
+  --> $DIR/redundant_pattern_matching.rs:54:5
    |
 LL | /     match Ok::<i32, i32>(42) {
 LL | |         Ok(_) => false,
@@ -85,7 +85,7 @@ LL | |     };
    | |_____^ help: try this: `Ok::<i32, i32>(42).is_err()`
 
 error: redundant pattern matching, consider using `is_err()`
-  --> $DIR/redundant_pattern_matching.rs:61:5
+  --> $DIR/redundant_pattern_matching.rs:59:5
    |
 LL | /     match Err::<i32, i32>(42) {
 LL | |         Ok(_) => false,
@@ -94,7 +94,7 @@ LL | |     };
    | |_____^ help: try this: `Err::<i32, i32>(42).is_err()`
 
 error: redundant pattern matching, consider using `is_ok()`
-  --> $DIR/redundant_pattern_matching.rs:66:5
+  --> $DIR/redundant_pattern_matching.rs:64:5
    |
 LL | /     match Err::<i32, i32>(42) {
 LL | |         Ok(_) => true,
@@ -103,7 +103,7 @@ LL | |     };
    | |_____^ help: try this: `Err::<i32, i32>(42).is_ok()`
 
 error: redundant pattern matching, consider using `is_some()`
-  --> $DIR/redundant_pattern_matching.rs:71:5
+  --> $DIR/redundant_pattern_matching.rs:69:5
    |
 LL | /     match Some(42) {
 LL | |         Some(_) => true,
@@ -112,7 +112,7 @@ LL | |     };
    | |_____^ help: try this: `Some(42).is_some()`
 
 error: redundant pattern matching, consider using `is_none()`
-  --> $DIR/redundant_pattern_matching.rs:76:5
+  --> $DIR/redundant_pattern_matching.rs:74:5
    |
 LL | /     match None::<()> {
 LL | |         Some(_) => false,
@@ -121,7 +121,7 @@ LL | |     };
    | |_____^ help: try this: `None::<()>.is_none()`
 
 error: redundant pattern matching, consider using `is_none()`
-  --> $DIR/redundant_pattern_matching.rs:81:13
+  --> $DIR/redundant_pattern_matching.rs:79:13
    |
 LL |       let _ = match None::<()> {
    |  _____________^
@@ -131,61 +131,61 @@ LL | |     };
    | |_____^ help: try this: `None::<()>.is_none()`
 
 error: redundant pattern matching, consider using `is_ok()`
-  --> $DIR/redundant_pattern_matching.rs:86:20
+  --> $DIR/redundant_pattern_matching.rs:84:20
    |
 LL |     let _ = if let Ok(_) = Ok::<usize, ()>(4) { true } else { false };
    |             -------^^^^^--------------------- help: try this: `if Ok::<usize, ()>(4).is_ok()`
 
 error: redundant pattern matching, consider using `is_some()`
-  --> $DIR/redundant_pattern_matching.rs:89:20
+  --> $DIR/redundant_pattern_matching.rs:87:20
    |
 LL |     let x = if let Some(_) = opt { true } else { false };
    |             -------^^^^^^^------ help: try this: `if opt.is_some()`
 
 error: redundant pattern matching, consider using `is_some()`
-  --> $DIR/redundant_pattern_matching.rs:95:20
+  --> $DIR/redundant_pattern_matching.rs:93:20
    |
 LL |     let _ = if let Some(_) = gen_opt() {
    |             -------^^^^^^^------------ help: try this: `if gen_opt().is_some()`
 
 error: redundant pattern matching, consider using `is_none()`
-  --> $DIR/redundant_pattern_matching.rs:97:19
+  --> $DIR/redundant_pattern_matching.rs:95:19
    |
 LL |     } else if let None = gen_opt() {
    |            -------^^^^------------ help: try this: `if gen_opt().is_none()`
 
 error: redundant pattern matching, consider using `is_ok()`
-  --> $DIR/redundant_pattern_matching.rs:99:19
+  --> $DIR/redundant_pattern_matching.rs:97:19
    |
 LL |     } else if let Ok(_) = gen_res() {
    |            -------^^^^^------------ help: try this: `if gen_res().is_ok()`
 
 error: redundant pattern matching, consider using `is_err()`
-  --> $DIR/redundant_pattern_matching.rs:101:19
+  --> $DIR/redundant_pattern_matching.rs:99:19
    |
 LL |     } else if let Err(_) = gen_res() {
    |            -------^^^^^^------------ help: try this: `if gen_res().is_err()`
 
 error: redundant pattern matching, consider using `is_some()`
-  --> $DIR/redundant_pattern_matching.rs:134:19
+  --> $DIR/redundant_pattern_matching.rs:132:19
    |
 LL |         while let Some(_) = r#try!(result_opt()) {}
    |         ----------^^^^^^^----------------------- help: try this: `while r#try!(result_opt()).is_some()`
 
 error: redundant pattern matching, consider using `is_some()`
-  --> $DIR/redundant_pattern_matching.rs:135:16
+  --> $DIR/redundant_pattern_matching.rs:133:16
    |
 LL |         if let Some(_) = r#try!(result_opt()) {}
    |         -------^^^^^^^----------------------- help: try this: `if r#try!(result_opt()).is_some()`
 
 error: redundant pattern matching, consider using `is_some()`
-  --> $DIR/redundant_pattern_matching.rs:141:12
+  --> $DIR/redundant_pattern_matching.rs:139:12
    |
 LL |     if let Some(_) = m!() {}
    |     -------^^^^^^^------- help: try this: `if m!().is_some()`
 
 error: redundant pattern matching, consider using `is_some()`
-  --> $DIR/redundant_pattern_matching.rs:142:15
+  --> $DIR/redundant_pattern_matching.rs:140:15
    |
 LL |     while let Some(_) = m!() {}
    |     ----------^^^^^^^------- help: try this: `while m!().is_some()`

src/tools/clippy/tests/ui/redundant_pattern_matching_const_result.fixed

@@ -1,7 +1,5 @@
 // run-rustfix
 
-#![feature(const_if_match)]
-#![feature(const_loop)]
 #![feature(const_result)]
 #![warn(clippy::redundant_pattern_matching)]
 #![allow(unused)]

src/tools/clippy/tests/ui/redundant_pattern_matching_const_result.rs

@@ -1,7 +1,5 @@
 // run-rustfix
 
-#![feature(const_if_match)]
-#![feature(const_loop)]
 #![feature(const_result)]
 #![warn(clippy::redundant_pattern_matching)]
 #![allow(unused)]

src/tools/clippy/tests/ui/redundant_pattern_matching_const_result.stderr

@@ -1,5 +1,5 @@
 error: redundant pattern matching, consider using `is_ok()`
-  --> $DIR/redundant_pattern_matching_const_result.rs:12:12
+  --> $DIR/redundant_pattern_matching_const_result.rs:10:12
    |
 LL |     if let Ok(_) = Ok::<i32, i32>(42) {}
    |     -------^^^^^--------------------- help: try this: `if Ok::<i32, i32>(42).is_ok()`
@@ -7,25 +7,25 @@ LL |     if let Ok(_) = Ok::<i32, i32>(42) {}
    = note: `-D clippy::redundant-pattern-matching` implied by `-D warnings`
 
 error: redundant pattern matching, consider using `is_err()`
-  --> $DIR/redundant_pattern_matching_const_result.rs:14:12
+  --> $DIR/redundant_pattern_matching_const_result.rs:12:12
    |
 LL |     if let Err(_) = Err::<i32, i32>(42) {}
    |     -------^^^^^^---------------------- help: try this: `if Err::<i32, i32>(42).is_err()`
 
 error: redundant pattern matching, consider using `is_ok()`
-  --> $DIR/redundant_pattern_matching_const_result.rs:16:15
+  --> $DIR/redundant_pattern_matching_const_result.rs:14:15
    |
 LL |     while let Ok(_) = Ok::<i32, i32>(10) {}
    |     ----------^^^^^--------------------- help: try this: `while Ok::<i32, i32>(10).is_ok()`
 
 error: redundant pattern matching, consider using `is_err()`
-  --> $DIR/redundant_pattern_matching_const_result.rs:18:15
+  --> $DIR/redundant_pattern_matching_const_result.rs:16:15
    |
 LL |     while let Err(_) = Ok::<i32, i32>(10) {}
    |     ----------^^^^^^--------------------- help: try this: `while Ok::<i32, i32>(10).is_err()`
 
 error: redundant pattern matching, consider using `is_ok()`
-  --> $DIR/redundant_pattern_matching_const_result.rs:20:5
+  --> $DIR/redundant_pattern_matching_const_result.rs:18:5
    |
 LL | /     match Ok::<i32, i32>(42) {
 LL | |         Ok(_) => true,
@@ -34,7 +34,7 @@ LL | |     };
    | |_____^ help: try this: `Ok::<i32, i32>(42).is_ok()`
 
 error: redundant pattern matching, consider using `is_err()`
-  --> $DIR/redundant_pattern_matching_const_result.rs:25:5
+  --> $DIR/redundant_pattern_matching_const_result.rs:23:5
    |
 LL | /     match Err::<i32, i32>(42) {
 LL | |         Ok(_) => false,