Use proper issue number for feature(const_slice_from_raw_parts)

Author: WaffleLapkin

library/core/src/slice/raw.rs

@@ -83,7 +83,7 @@ use crate::ptr;
 /// [`NonNull::dangling()`]: ptr::NonNull::dangling
 #[inline]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature = "const_slice_from_raw_parts", issue = "none")]
+#[rustc_const_unstable(feature = "const_slice_from_raw_parts", issue = "67456")]
 pub const unsafe fn from_raw_parts<'a, T>(data: *const T, len: usize) -> &'a [T] {
     debug_check_data_len(data, len);
 
@@ -122,7 +122,7 @@ pub const unsafe fn from_raw_parts<'a, T>(data: *const T, len: usize) -> &'a [T]
 /// [`NonNull::dangling()`]: ptr::NonNull::dangling
 #[inline]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature = "const_slice_from_raw_parts", issue = "none")]
+#[rustc_const_unstable(feature = "const_slice_from_raw_parts", issue = "67456")]
 pub const unsafe fn from_raw_parts_mut<'a, T>(data: *mut T, len: usize) -> &'a mut [T] {
     debug_check_data_len(data as _, len);
 
@@ -132,8 +132,8 @@ pub const unsafe fn from_raw_parts_mut<'a, T>(data: *mut T, len: usize) -> &'a m
 
 // In debug builds checks that `data` pointer is aligned and non-null and that slice with given `len` would cover less than half the address space
 #[cfg(all(not(bootstrap), debug_assertions))]
-#[unstable(feature = "const_slice_from_raw_parts", issue = "none")]
-#[rustc_const_unstable(feature = "const_slice_from_raw_parts", issue = "none")]
+#[unstable(feature = "const_slice_from_raw_parts", issue = "67456")]
+#[rustc_const_unstable(feature = "const_slice_from_raw_parts", issue = "67456")]
 const fn debug_check_data_len<T>(data: *const T, len: usize) {
     fn rt_check<T>(data: *const T) {
         use crate::intrinsics::is_aligned_and_not_null;