Remove unnecessary const blocks.

compiler/rustc_data_structures/src/sip128.rs

@@ -188,7 +188,7 @@ impl SipHasher128 {
     pub fn new_with_keys(key0: u64, key1: u64) -> SipHasher128 {
         let mut hasher = SipHasher128 {
             nbuf: 0,
-            buf: [const { MaybeUninit::uninit() }; BUFFER_WITH_SPILL_CAPACITY],
+            buf: [MaybeUninit::uninit(); BUFFER_WITH_SPILL_CAPACITY],
             state: State {
                 v0: key0 ^ 0x736f6d6570736575,
                 // The XOR with 0xee is only done on 128-bit algorithm version.

library/core/src/fmt/float.rs

@@ -35,8 +35,8 @@ fn float_to_decimal_common_exact<T>(
 where
     T: flt2dec::DecodableFloat,
 {
-    let mut buf: [MaybeUninit<u8>; 1024] = [const { MaybeUninit::uninit() }; 1024]; // enough for f32 and f64
-    let mut parts: [MaybeUninit<numfmt::Part<'_>>; 4] = [const { MaybeUninit::uninit() }; 4];
+    let mut buf: [MaybeUninit<u8>; 1024] = [MaybeUninit::uninit(); 1024]; // enough for f32 and f64
+    let mut parts: [MaybeUninit<numfmt::Part<'_>>; 4] = [MaybeUninit::uninit(); 4];
     let formatted = flt2dec::to_exact_fixed_str(
         flt2dec::strategy::grisu::format_exact,
         *num,
@@ -63,8 +63,8 @@ where
 {
     // enough for f32 and f64
     let mut buf: [MaybeUninit<u8>; flt2dec::MAX_SIG_DIGITS] =
-        [const { MaybeUninit::uninit() }; flt2dec::MAX_SIG_DIGITS];
-    let mut parts: [MaybeUninit<numfmt::Part<'_>>; 4] = [const { MaybeUninit::uninit() }; 4];
+        [MaybeUninit::uninit(); flt2dec::MAX_SIG_DIGITS];
+    let mut parts: [MaybeUninit<numfmt::Part<'_>>; 4] = [MaybeUninit::uninit(); 4];
     let formatted = flt2dec::to_shortest_str(
         flt2dec::strategy::grisu::format_shortest,
         *num,
@@ -108,8 +108,8 @@ fn float_to_exponential_common_exact<T>(
 where
     T: flt2dec::DecodableFloat,
 {
-    let mut buf: [MaybeUninit<u8>; 1024] = [const { MaybeUninit::uninit() }; 1024]; // enough for f32 and f64
-    let mut parts: [MaybeUninit<numfmt::Part<'_>>; 6] = [const { MaybeUninit::uninit() }; 6];
+    let mut buf: [MaybeUninit<u8>; 1024] = [MaybeUninit::uninit(); 1024]; // enough for f32 and f64
+    let mut parts: [MaybeUninit<numfmt::Part<'_>>; 6] = [MaybeUninit::uninit(); 6];
     let formatted = flt2dec::to_exact_exp_str(
         flt2dec::strategy::grisu::format_exact,
         *num,
@@ -137,8 +137,8 @@ where
 {
     // enough for f32 and f64
     let mut buf: [MaybeUninit<u8>; flt2dec::MAX_SIG_DIGITS] =
-        [const { MaybeUninit::uninit() }; flt2dec::MAX_SIG_DIGITS];
-    let mut parts: [MaybeUninit<numfmt::Part<'_>>; 6] = [const { MaybeUninit::uninit() }; 6];
+        [MaybeUninit::uninit(); flt2dec::MAX_SIG_DIGITS];
+    let mut parts: [MaybeUninit<numfmt::Part<'_>>; 6] = [MaybeUninit::uninit(); 6];
     let formatted = flt2dec::to_shortest_exp_str(
         flt2dec::strategy::grisu::format_shortest,
         *num,

library/core/src/mem/maybe_uninit.rs

@@ -883,7 +883,7 @@ impl<T> MaybeUninit<T> {
     /// #![feature(maybe_uninit_array_assume_init)]
     /// use std::mem::MaybeUninit;
     ///
-    /// let mut array: [MaybeUninit<i32>; 3] = [const { MaybeUninit::uninit() }; 3];
+    /// let mut array: [MaybeUninit<i32>; 3] = [MaybeUninit::uninit(); 3];
     /// array[0].write(0);
     /// array[1].write(1);
     /// array[2].write(2);

library/core/src/net/display_buffer.rs

@@ -11,7 +11,7 @@ pub struct DisplayBuffer<const SIZE: usize> {
 impl<const SIZE: usize> DisplayBuffer<SIZE> {
     #[inline]
     pub const fn new() -> Self {
-        Self { buf: [const { MaybeUninit::uninit() }; SIZE], len: 0 }
+        Self { buf: [MaybeUninit::uninit(); SIZE], len: 0 }
     }
 
     #[inline]

library/std/src/fs/tests.rs

@@ -406,7 +406,7 @@ fn file_test_read_buf() {
     let filename = &tmpdir.join("test");
     check!(fs::write(filename, &[1, 2, 3, 4]));
 
-    let mut buf: [MaybeUninit<u8>; 128] = [const { MaybeUninit::uninit() }; 128];
+    let mut buf: [MaybeUninit<u8>; 128] = [MaybeUninit::uninit(); 128];
     let mut buf = BorrowedBuf::from(buf.as_mut_slice());
     let mut file = check!(File::open(filename));
     check!(file.read_buf(buf.unfilled()));

library/std/src/net/tcp/tests.rs

@@ -301,7 +301,7 @@ fn read_buf() {
         });
 
         let mut s = t!(srv.accept()).0;
-        let mut buf: [MaybeUninit<u8>; 128] = [const { MaybeUninit::uninit() }; 128];
+        let mut buf: [MaybeUninit<u8>; 128] = [MaybeUninit::uninit(); 128];
         let mut buf = BorrowedBuf::from(buf.as_mut_slice());
         t!(s.read_buf(buf.unfilled()));
         assert_eq!(buf.filled(), &[1, 2, 3, 4]);

library/std/src/process/tests.rs

@@ -137,7 +137,7 @@ fn child_stdout_read_buf() {
     let child = cmd.spawn().unwrap();
 
     let mut stdout = child.stdout.unwrap();
-    let mut buf: [MaybeUninit<u8>; 128] = [const { MaybeUninit::uninit() }; 128];
+    let mut buf: [MaybeUninit<u8>; 128] = [MaybeUninit::uninit(); 128];
     let mut buf = BorrowedBuf::from(buf.as_mut_slice());
     stdout.read_buf(buf.unfilled()).unwrap();
 

library/std/src/sys/pal/windows/mod.rs

@@ -227,7 +227,7 @@ where
     // This initial size also works around `GetFullPathNameW` returning
     // incorrect size hints for some short paths:
     // https://github.com/dylni/normpath/issues/5
-    let mut stack_buf: [MaybeUninit<u16>; 512] = [const { MaybeUninit::uninit() }; 512];
+    let mut stack_buf: [MaybeUninit<u16>; 512] = [MaybeUninit::uninit(); 512];
     let mut heap_buf: Vec<MaybeUninit<u16>> = Vec::new();
     unsafe {
         let mut n = stack_buf.len();