Auto merge of #57234 - Centril:const-stabilizations-2, r=oli-obk

Const-stabilize `const_int_ops` + `const_ip`

r? @oli-obk

## Note for relnotes: This PR includes https://github.com/rust-lang/rust/pull/57105.

I've added T-lang since this affects intrinsics and the operational semantics of Rust's `const fn` fragment.

## Stable APIs proposed for constification

+ `const_int_ops`:
    + `count_ones`
    + `count_zeros`
    + `leading_zeros`
    + `trailing_zeros`
    + `swap_bytes`
    + `from_be`
    + `from_le`
    + `to_be`
    + `to_le`
+ `const_ip`
    + `Ipv4Addr::new`

## Unstable APIs constified

+ `const_int_conversion`:
    + `reverse_bits`

2 files changed, 428 insertions, 15 deletions

diff --git a/src/test/ui/consts/const-int-unchecked.rs b/src/test/ui/consts/const-int-unchecked.rs
index aeac6c37dcb..8ee029b6cc3 100644
--- a/src/test/ui/consts/const-int-unchecked.rs
+++ b/src/test/ui/consts/const-int-unchecked.rs
@@ -2,10 +2,119 @@
 
 use std::intrinsics;
 
-const SHR: u8 = unsafe { intrinsics::unchecked_shr(5_u8, 8) };
+// The documentation of `unchecked_shl` states that it:
+//
+// Performs an unchecked left shift, resulting in undefined behavior when
+// y < 0 or y >= N, where N is the width of T in bits.
+//
+// So we check this for a few `y`.
+
+// unsigned types:
+
+const SHL_U8: u8 = unsafe { intrinsics::unchecked_shl(5_u8, 8) };
+//~^ ERROR any use of this value will cause an error
+const SHL_U16: u16 = unsafe { intrinsics::unchecked_shl(5_u16, 16) };
+//~^ ERROR any use of this value will cause an error
+const SHL_U32: u32 = unsafe { intrinsics::unchecked_shl(5_u32, 32) };
+//~^ ERROR any use of this value will cause an error
+const SHL_U64: u64 = unsafe { intrinsics::unchecked_shl(5_u64, 64) };
+//~^ ERROR any use of this value will cause an error
+const SHL_U128: u128 = unsafe { intrinsics::unchecked_shl(5_u128, 128) };
+//~^ ERROR any use of this value will cause an error
+
+// signed types:
+
+const SHL_I8: i8 = unsafe { intrinsics::unchecked_shl(5_i8, 8) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I16: i16 = unsafe { intrinsics::unchecked_shl(5_16, 16) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I32: i32 = unsafe { intrinsics::unchecked_shl(5_i32, 32) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I64: i64 = unsafe { intrinsics::unchecked_shl(5_i64, 64) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I128: i128 = unsafe { intrinsics::unchecked_shl(5_i128, 128) };
+//~^ ERROR any use of this value will cause an error
+
+// and make sure we capture y < 0:
+
+const SHL_I8_NEG: i8 = unsafe { intrinsics::unchecked_shl(5_i8, -1) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I16_NEG: i16 = unsafe { intrinsics::unchecked_shl(5_16, -1) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I32_NEG: i32 = unsafe { intrinsics::unchecked_shl(5_i32, -1) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I64_NEG: i64 = unsafe { intrinsics::unchecked_shl(5_i64, -1) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I128_NEG: i128 = unsafe { intrinsics::unchecked_shl(5_i128, -1) };
+//~^ ERROR any use of this value will cause an error
+
+// and that there's no special relation to the value -1 by picking some
+// negative values at random:
+
+const SHL_I8_NEG_RANDOM: i8 = unsafe { intrinsics::unchecked_shl(5_i8, -6) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I16_NEG_RANDOM: i16 = unsafe { intrinsics::unchecked_shl(5_16, -13) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I32_NEG_RANDOM: i32 = unsafe { intrinsics::unchecked_shl(5_i32, -25) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I64_NEG_RANDOM: i64 = unsafe { intrinsics::unchecked_shl(5_i64, -30) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I128_NEG_RANDOM: i128 = unsafe { intrinsics::unchecked_shl(5_i128, -93) };
+//~^ ERROR any use of this value will cause an error
+
+// Repeat it all over for `unchecked_shr`
+
+// unsigned types:
+
+const SHR_U8: u8 = unsafe { intrinsics::unchecked_shr(5_u8, 8) };
+//~^ ERROR any use of this value will cause an error
+const SHR_U16: u16 = unsafe { intrinsics::unchecked_shr(5_u16, 16) };
+//~^ ERROR any use of this value will cause an error
+const SHR_U32: u32 = unsafe { intrinsics::unchecked_shr(5_u32, 32) };
+//~^ ERROR any use of this value will cause an error
+const SHR_U64: u64 = unsafe { intrinsics::unchecked_shr(5_u64, 64) };
+//~^ ERROR any use of this value will cause an error
+const SHR_U128: u128 = unsafe { intrinsics::unchecked_shr(5_u128, 128) };
+//~^ ERROR any use of this value will cause an error
+
+// signed types:
+
+const SHR_I8: i8 = unsafe { intrinsics::unchecked_shr(5_i8, 8) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I16: i16 = unsafe { intrinsics::unchecked_shr(5_16, 16) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I32: i32 = unsafe { intrinsics::unchecked_shr(5_i32, 32) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I64: i64 = unsafe { intrinsics::unchecked_shr(5_i64, 64) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I128: i128 = unsafe { intrinsics::unchecked_shr(5_i128, 128) };
+//~^ ERROR any use of this value will cause an error
+
+// and make sure we capture y < 0:
+
+const SHR_I8_NEG: i8 = unsafe { intrinsics::unchecked_shr(5_i8, -1) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I16_NEG: i16 = unsafe { intrinsics::unchecked_shr(5_16, -1) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I32_NEG: i32 = unsafe { intrinsics::unchecked_shr(5_i32, -1) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I64_NEG: i64 = unsafe { intrinsics::unchecked_shr(5_i64, -1) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I128_NEG: i128 = unsafe { intrinsics::unchecked_shr(5_i128, -1) };
+//~^ ERROR any use of this value will cause an error
+
+// and that there's no special relation to the value -1 by picking some
+// negative values at random:
+
+const SHR_I8_NEG_RANDOM: i8 = unsafe { intrinsics::unchecked_shr(5_i8, -6) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I16_NEG_RANDOM: i16 = unsafe { intrinsics::unchecked_shr(5_16, -13) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I32_NEG_RANDOM: i32 = unsafe { intrinsics::unchecked_shr(5_i32, -25) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I64_NEG_RANDOM: i64 = unsafe { intrinsics::unchecked_shr(5_i64, -30) };
 //~^ ERROR any use of this value will cause an error
-const SHL: u8 = unsafe { intrinsics::unchecked_shl(5_u8, 8) };
+const SHR_I128_NEG_RANDOM: i128 = unsafe { intrinsics::unchecked_shr(5_i128, -93) };
 //~^ ERROR any use of this value will cause an error
 
-fn main() {
-}
+fn main() {}
diff --git a/src/test/ui/consts/const-int-unchecked.stderr b/src/test/ui/consts/const-int-unchecked.stderr
index dd28cc4d533..4382d9174b7 100644
--- a/src/test/ui/consts/const-int-unchecked.stderr
+++ b/src/test/ui/consts/const-int-unchecked.stderr
@@ -1,20 +1,324 @@
 error: any use of this value will cause an error
-  --> $DIR/const-int-unchecked.rs:5:1
+  --> $DIR/const-int-unchecked.rs:14:1
    |
-LL | const SHR: u8 = unsafe { intrinsics::unchecked_shr(5_u8, 8) };
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^----------------------------------^^^
-   |                          |
-   |                          Overflowing shift by 8 in unchecked_shr
+LL | const SHL_U8: u8 = unsafe { intrinsics::unchecked_shl(5_u8, 8) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^----------------------------------^^^
+   |                             |
+   |                             Overflowing shift by 8 in unchecked_shl
    |
    = note: #[deny(const_err)] on by default
 
 error: any use of this value will cause an error
-  --> $DIR/const-int-unchecked.rs:7:1
+  --> $DIR/const-int-unchecked.rs:16:1
    |
-LL | const SHL: u8 = unsafe { intrinsics::unchecked_shl(5_u8, 8) };
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^----------------------------------^^^
-   |                          |
-   |                          Overflowing shift by 8 in unchecked_shl
+LL | const SHL_U16: u16 = unsafe { intrinsics::unchecked_shl(5_u16, 16) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------------------------------------^^^
+   |                               |
+   |                               Overflowing shift by 16 in unchecked_shl
 
-error: aborting due to 2 previous errors
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:18:1
+   |
+LL | const SHL_U32: u32 = unsafe { intrinsics::unchecked_shl(5_u32, 32) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------------------------------------^^^
+   |                               |
+   |                               Overflowing shift by 32 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:20:1
+   |
+LL | const SHL_U64: u64 = unsafe { intrinsics::unchecked_shl(5_u64, 64) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------------------------------------^^^
+   |                               |
+   |                               Overflowing shift by 64 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:22:1
+   |
+LL | const SHL_U128: u128 = unsafe { intrinsics::unchecked_shl(5_u128, 128) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^--------------------------------------^^^
+   |                                 |
+   |                                 Overflowing shift by 128 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:27:1
+   |
+LL | const SHL_I8: i8 = unsafe { intrinsics::unchecked_shl(5_i8, 8) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^----------------------------------^^^
+   |                             |
+   |                             Overflowing shift by 8 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:29:1
+   |
+LL | const SHL_I16: i16 = unsafe { intrinsics::unchecked_shl(5_16, 16) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-----------------------------------^^^
+   |                               |
+   |                               Overflowing shift by 16 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:31:1
+   |
+LL | const SHL_I32: i32 = unsafe { intrinsics::unchecked_shl(5_i32, 32) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------------------------------------^^^
+   |                               |
+   |                               Overflowing shift by 32 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:33:1
+   |
+LL | const SHL_I64: i64 = unsafe { intrinsics::unchecked_shl(5_i64, 64) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------------------------------------^^^
+   |                               |
+   |                               Overflowing shift by 64 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:35:1
+   |
+LL | const SHL_I128: i128 = unsafe { intrinsics::unchecked_shl(5_i128, 128) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^--------------------------------------^^^
+   |                                 |
+   |                                 Overflowing shift by 128 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:40:1
+   |
+LL | const SHL_I8_NEG: i8 = unsafe { intrinsics::unchecked_shl(5_i8, -1) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-----------------------------------^^^
+   |                                 |
+   |                                 Overflowing shift by 255 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:42:1
+   |
+LL | const SHL_I16_NEG: i16 = unsafe { intrinsics::unchecked_shl(5_16, -1) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-----------------------------------^^^
+   |                                   |
+   |                                   Overflowing shift by 65535 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:44:1
+   |
+LL | const SHL_I32_NEG: i32 = unsafe { intrinsics::unchecked_shl(5_i32, -1) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------------------------------------^^^
+   |                                   |
+   |                                   Overflowing shift by 4294967295 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:46:1
+   |
+LL | const SHL_I64_NEG: i64 = unsafe { intrinsics::unchecked_shl(5_i64, -1) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------------------------------------^^^
+   |                                   |
+   |                                   Overflowing shift by 18446744073709551615 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:48:1
+   |
+LL | const SHL_I128_NEG: i128 = unsafe { intrinsics::unchecked_shl(5_i128, -1) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-------------------------------------^^^
+   |                                     |
+   |                                     Overflowing shift by 340282366920938463463374607431768211455 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:54:1
+   |
+LL | const SHL_I8_NEG_RANDOM: i8 = unsafe { intrinsics::unchecked_shl(5_i8, -6) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-----------------------------------^^^
+   |                                        |
+   |                                        Overflowing shift by 250 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:56:1
+   |
+LL | const SHL_I16_NEG_RANDOM: i16 = unsafe { intrinsics::unchecked_shl(5_16, -13) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------------------------------------^^^
+   |                                          |
+   |                                          Overflowing shift by 65523 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:58:1
+   |
+LL | const SHL_I32_NEG_RANDOM: i32 = unsafe { intrinsics::unchecked_shl(5_i32, -25) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-------------------------------------^^^
+   |                                          |
+   |                                          Overflowing shift by 4294967271 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:60:1
+   |
+LL | const SHL_I64_NEG_RANDOM: i64 = unsafe { intrinsics::unchecked_shl(5_i64, -30) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-------------------------------------^^^
+   |                                          |
+   |                                          Overflowing shift by 18446744073709551586 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:62:1
+   |
+LL | const SHL_I128_NEG_RANDOM: i128 = unsafe { intrinsics::unchecked_shl(5_i128, -93) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^--------------------------------------^^^
+   |                                            |
+   |                                            Overflowing shift by 340282366920938463463374607431768211363 in unchecked_shl
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:69:1
+   |
+LL | const SHR_U8: u8 = unsafe { intrinsics::unchecked_shr(5_u8, 8) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^----------------------------------^^^
+   |                             |
+   |                             Overflowing shift by 8 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:71:1
+   |
+LL | const SHR_U16: u16 = unsafe { intrinsics::unchecked_shr(5_u16, 16) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------------------------------------^^^
+   |                               |
+   |                               Overflowing shift by 16 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:73:1
+   |
+LL | const SHR_U32: u32 = unsafe { intrinsics::unchecked_shr(5_u32, 32) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------------------------------------^^^
+   |                               |
+   |                               Overflowing shift by 32 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:75:1
+   |
+LL | const SHR_U64: u64 = unsafe { intrinsics::unchecked_shr(5_u64, 64) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------------------------------------^^^
+   |                               |
+   |                               Overflowing shift by 64 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:77:1
+   |
+LL | const SHR_U128: u128 = unsafe { intrinsics::unchecked_shr(5_u128, 128) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^--------------------------------------^^^
+   |                                 |
+   |                                 Overflowing shift by 128 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:82:1
+   |
+LL | const SHR_I8: i8 = unsafe { intrinsics::unchecked_shr(5_i8, 8) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^----------------------------------^^^
+   |                             |
+   |                             Overflowing shift by 8 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:84:1
+   |
+LL | const SHR_I16: i16 = unsafe { intrinsics::unchecked_shr(5_16, 16) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-----------------------------------^^^
+   |                               |
+   |                               Overflowing shift by 16 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:86:1
+   |
+LL | const SHR_I32: i32 = unsafe { intrinsics::unchecked_shr(5_i32, 32) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------------------------------------^^^
+   |                               |
+   |                               Overflowing shift by 32 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:88:1
+   |
+LL | const SHR_I64: i64 = unsafe { intrinsics::unchecked_shr(5_i64, 64) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------------------------------------^^^
+   |                               |
+   |                               Overflowing shift by 64 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:90:1
+   |
+LL | const SHR_I128: i128 = unsafe { intrinsics::unchecked_shr(5_i128, 128) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^--------------------------------------^^^
+   |                                 |
+   |                                 Overflowing shift by 128 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:95:1
+   |
+LL | const SHR_I8_NEG: i8 = unsafe { intrinsics::unchecked_shr(5_i8, -1) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-----------------------------------^^^
+   |                                 |
+   |                                 Overflowing shift by 255 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:97:1
+   |
+LL | const SHR_I16_NEG: i16 = unsafe { intrinsics::unchecked_shr(5_16, -1) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-----------------------------------^^^
+   |                                   |
+   |                                   Overflowing shift by 65535 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:99:1
+   |
+LL | const SHR_I32_NEG: i32 = unsafe { intrinsics::unchecked_shr(5_i32, -1) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------------------------------------^^^
+   |                                   |
+   |                                   Overflowing shift by 4294967295 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:101:1
+   |
+LL | const SHR_I64_NEG: i64 = unsafe { intrinsics::unchecked_shr(5_i64, -1) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------------------------------------^^^
+   |                                   |
+   |                                   Overflowing shift by 18446744073709551615 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:103:1
+   |
+LL | const SHR_I128_NEG: i128 = unsafe { intrinsics::unchecked_shr(5_i128, -1) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-------------------------------------^^^
+   |                                     |
+   |                                     Overflowing shift by 340282366920938463463374607431768211455 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:109:1
+   |
+LL | const SHR_I8_NEG_RANDOM: i8 = unsafe { intrinsics::unchecked_shr(5_i8, -6) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-----------------------------------^^^
+   |                                        |
+   |                                        Overflowing shift by 250 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:111:1
+   |
+LL | const SHR_I16_NEG_RANDOM: i16 = unsafe { intrinsics::unchecked_shr(5_16, -13) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^------------------------------------^^^
+   |                                          |
+   |                                          Overflowing shift by 65523 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:113:1
+   |
+LL | const SHR_I32_NEG_RANDOM: i32 = unsafe { intrinsics::unchecked_shr(5_i32, -25) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-------------------------------------^^^
+   |                                          |
+   |                                          Overflowing shift by 4294967271 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:115:1
+   |
+LL | const SHR_I64_NEG_RANDOM: i64 = unsafe { intrinsics::unchecked_shr(5_i64, -30) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-------------------------------------^^^
+   |                                          |
+   |                                          Overflowing shift by 18446744073709551586 in unchecked_shr
+
+error: any use of this value will cause an error
+  --> $DIR/const-int-unchecked.rs:117:1
+   |
+LL | const SHR_I128_NEG_RANDOM: i128 = unsafe { intrinsics::unchecked_shr(5_i128, -93) };
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^--------------------------------------^^^
+   |                                            |
+   |                                            Overflowing shift by 340282366920938463463374607431768211363 in unchecked_shr
+
+error: aborting due to 40 previous errors