fix: Move CoerceShared into ops

library/core/src/marker.rs

@@ -1372,12 +1372,3 @@ pub trait CoercePointeeValidated {
 pub trait Reborrow {
     // Empty.
 }
-
-/// Allows reborrowable value to be reborrowed as shared, creating a copy of
-/// that disables the source for writes for the lifetime of the copy.
-#[lang = "coerce_shared"]
-#[unstable(feature = "reborrow", issue = "145612")]
-pub trait CoerceShared: Reborrow {
-    /// The type of this value when reborrowed as shared.
-    type Target: Copy;
-}

library/core/src/ops/mod.rs

@@ -149,6 +149,7 @@ mod function;
 mod index;
 mod index_range;
 mod range;
+mod reborrow;
 mod try_trait;
 mod unsize;
 
@@ -189,6 +190,8 @@ pub use self::range::{Bound, RangeBounds, RangeInclusive, RangeToInclusive};
 pub use self::range::{OneSidedRange, OneSidedRangeBound};
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use self::range::{Range, RangeFrom, RangeFull, RangeTo};
+#[unstable(feature = "reborrow", issue = "145612")]
+pub use self::reborrow::CoerceShared;
 #[unstable(feature = "try_trait_v2_residual", issue = "91285")]
 pub use self::try_trait::Residual;
 #[unstable(feature = "try_trait_v2_yeet", issue = "96374")]

library/core/src/ops/reborrow.rs

@@ -0,0 +1,10 @@
+use crate::marker::Reborrow;
+
+/// Allows reborrowable value to be reborrowed as shared, creating a copy
+/// that disables the source for writes for the lifetime of the copy.
+#[lang = "coerce_shared"]
+#[unstable(feature = "reborrow", issue = "145612")]
+pub trait CoerceShared: Reborrow {
+    /// The type of this value when reborrowed as shared.
+    type Target: Copy;
+}

tests/ui/feature-gates/feature-gate-reborrow-coerce-shared.rs

@@ -1,3 +1,3 @@
-use std::marker::CoerceShared; //~ ERROR  use of unstable library feature `reborrow`
+use std::ops::CoerceShared; //~ ERROR  use of unstable library feature `reborrow`
 
 fn main() {}

tests/ui/feature-gates/feature-gate-reborrow-coerce-shared.stderr

@@ -1,8 +1,8 @@
 error[E0658]: use of unstable library feature `reborrow`
   --> $DIR/feature-gate-reborrow-coerce-shared.rs:1:5
    |
-LL | use std::marker::CoerceShared;
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | use std::ops::CoerceShared;
+   |     ^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #145612 <https://github.com/rust-lang/rust/issues/145612> for more information
    = help: add `#![feature(reborrow)]` to the crate attributes to enable

tests/ui/reborrow/custom_mut_coerce_shared.rs

@@ -1,5 +1,6 @@
 #![feature(reborrow)]
-use std::marker::{Reborrow, CoerceShared};
+use std::marker::Reborrow;
+use std::ops::CoerceShared;
 
 struct CustomMut<'a, T>(&'a mut T);
 impl<'a, T> Reborrow for CustomMut<'a, T> {}

tests/ui/reborrow/custom_mut_coerce_shared.stderr

@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/custom_mut_coerce_shared.rs:23:12
+  --> $DIR/custom_mut_coerce_shared.rs:24:12
    |
 LL |     method(a);
    |     ------ ^ expected `CustomRef<'_, ()>`, found `CustomMut<'_, ()>`
@@ -9,7 +9,7 @@ LL |     method(a);
    = note: expected struct `CustomRef<'_, ()>`
               found struct `CustomMut<'_, ()>`
 note: function defined here
-  --> $DIR/custom_mut_coerce_shared.rs:19:4
+  --> $DIR/custom_mut_coerce_shared.rs:20:4
    |
 LL | fn method(a: CustomRef<'_, ()>) {}
    |    ^^^^^^ --------------------