Auto merge of rust-lang#121952 - JarvisCraft:master, r=workingjubilee

feat: implement `{Div,Rem}Assign<NonZero<X>>` on `X`

# Description

This PR implements `DivAssign<X>` and `RemAssign<X>` on `X` as suggested in rust-lang/libs-team#346.

Since this is just a trait implementation on an already stable type, for which non-assign operator traits are already stable, I suggest that it is an insta-stable feature.

Author: bors

library/core/src/num/nonzero.rs

@@ -5,7 +5,7 @@ use crate::fmt;
 use crate::hash::{Hash, Hasher};
 use crate::intrinsics;
 use crate::marker::{Freeze, StructuralPartialEq};
-use crate::ops::{BitOr, BitOrAssign, Div, Neg, Rem};
+use crate::ops::{BitOr, BitOrAssign, Div, DivAssign, Neg, Rem, RemAssign};
 use crate::panic::{RefUnwindSafe, UnwindSafe};
 use crate::ptr;
 use crate::str::FromStr;
@@ -849,6 +849,16 @@ macro_rules! nonzero_integer_signedness_dependent_impls {
             }
         }
 
+        #[stable(feature = "nonzero_div_assign", since = "CURRENT_RUSTC_VERSION")]
+        impl DivAssign<$Ty> for $Int {
+            /// This operation rounds towards zero,
+            /// truncating any fractional part of the exact result, and cannot panic.
+            #[inline]
+            fn div_assign(&mut self, other: $Ty) {
+                *self = *self / other;
+            }
+        }
+
         #[stable(feature = "nonzero_div", since = "1.51.0")]
         impl Rem<$Ty> for $Int {
             type Output = $Int;
@@ -861,6 +871,15 @@ macro_rules! nonzero_integer_signedness_dependent_impls {
                 unsafe { intrinsics::unchecked_rem(self, other.get()) }
             }
         }
+
+        #[stable(feature = "nonzero_div_assign", since = "CURRENT_RUSTC_VERSION")]
+        impl RemAssign<$Ty> for $Int {
+            /// This operation satisfies `n % d == n - (n / d) * d`, and cannot panic.
+            #[inline]
+            fn rem_assign(&mut self, other: $Ty) {
+                *self = *self % other;
+            }
+        }
     };
 
     // Impls for signed nonzero types only.