Rollup merge of #125951 - slanterns:error_in_core_stabilization, r=Amanieu

Stabilize `error_in_core`

Closes: https://github.com/rust-lang/rust/issues/103765.

`@rustbot` label: +T-libs-api

r? libs-api

library/alloc/src/lib.rs

@@ -121,7 +121,6 @@
 #![feature(deref_pure_trait)]
 #![feature(dispatch_from_dyn)]
 #![feature(error_generic_member_access)]
-#![feature(error_in_core)]
 #![feature(exact_size_is_empty)]
 #![feature(extend_one)]
 #![feature(fmt_internals)]

library/core/src/error.rs

@@ -1,5 +1,5 @@
 #![doc = include_str!("error.md")]
-#![unstable(feature = "error_in_core", issue = "103765")]
+#![stable(feature = "error_in_core", since = "CURRENT_RUSTC_VERSION")]
 
 #[cfg(test)]
 mod tests;
@@ -130,7 +130,6 @@ pub trait Error: Debug + Display {
     ///
     /// ```rust
     /// #![feature(error_generic_member_access)]
-    /// #![feature(error_in_core)]
     /// use core::fmt;
     /// use core::error::{request_ref, Request};
     ///
@@ -361,8 +360,7 @@ impl dyn Error {
 /// Get a string value from an error.
 ///
 /// ```rust
-/// # #![feature(error_generic_member_access)]
-/// # #![feature(error_in_core)]
+/// #![feature(error_generic_member_access)]
 /// use std::error::Error;
 /// use core::error::request_value;
 ///
@@ -385,8 +383,7 @@ where
 /// Get a string reference from an error.
 ///
 /// ```rust
-/// # #![feature(error_generic_member_access)]
-/// # #![feature(error_in_core)]
+/// #![feature(error_generic_member_access)]
 /// use core::error::Error;
 /// use core::error::request_ref;
 ///
@@ -458,7 +455,6 @@ where
 ///
 /// ```
 /// #![feature(error_generic_member_access)]
-/// #![feature(error_in_core)]
 /// use core::fmt;
 /// use core::error::Request;
 /// use core::error::request_ref;
@@ -529,7 +525,6 @@ impl<'a> Request<'a> {
     ///
     /// ```rust
     /// #![feature(error_generic_member_access)]
-    /// #![feature(error_in_core)]
     ///
     /// use core::error::Request;
     ///
@@ -564,7 +559,6 @@ impl<'a> Request<'a> {
     ///
     /// ```rust
     /// #![feature(error_generic_member_access)]
-    /// #![feature(error_in_core)]
     ///
     /// use core::error::Request;
     ///
@@ -600,7 +594,6 @@ impl<'a> Request<'a> {
     ///
     /// ```rust
     /// #![feature(error_generic_member_access)]
-    /// #![feature(error_in_core)]
     ///
     /// use core::error::Request;
     ///
@@ -633,7 +626,6 @@ impl<'a> Request<'a> {
     ///
     /// ```rust
     /// #![feature(error_generic_member_access)]
-    /// #![feature(error_in_core)]
     ///
     /// use core::error::Request;
     ///
@@ -700,7 +692,6 @@ impl<'a> Request<'a> {
     ///
     /// ```rust
     /// #![feature(error_generic_member_access)]
-    /// #![feature(error_in_core)]
     ///
     /// use core::error::Request;
     /// use core::error::request_value;
@@ -788,7 +779,6 @@ impl<'a> Request<'a> {
     ///
     /// ```rust
     /// #![feature(error_generic_member_access)]
-    /// #![feature(error_in_core)]
     ///
     /// use core::error::Request;
     /// use core::error::request_ref;

library/core/tests/lib.rs

@@ -112,7 +112,6 @@
 #![feature(const_slice_from_ref)]
 #![feature(waker_getters)]
 #![feature(error_generic_member_access)]
-#![feature(error_in_core)]
 #![feature(trait_upcasting)]
 #![feature(is_ascii_octdigit)]
 #![feature(get_many_mut)]

library/std/src/lib.rs

@@ -324,7 +324,6 @@
 #![feature(core_io_borrowed_buf)]
 #![feature(duration_constants)]
 #![feature(error_generic_member_access)]
-#![feature(error_in_core)]
 #![feature(error_iter)]
 #![feature(exact_size_is_empty)]
 #![feature(exclusive_wrapper)]

src/tools/clippy/tests/ui/std_instead_of_core.fixed

@@ -45,8 +45,8 @@ fn std_instead_of_core() {
 
     let _ = std::env!("PATH");
 
-    // do not lint until `error_in_core` is stable
-    use std::error::Error;
+    use core::error::Error;
+    //~^ ERROR: used import from `std` instead of `core`
 
     // lint items re-exported from private modules, `core::iter::traits::iterator::Iterator`
     use core::iter::Iterator;

src/tools/clippy/tests/ui/std_instead_of_core.rs

@@ -45,8 +45,8 @@ fn std_instead_of_core() {
 
     let _ = std::env!("PATH");
 
-    // do not lint until `error_in_core` is stable
     use std::error::Error;
+    //~^ ERROR: used import from `std` instead of `core`
 
     // lint items re-exported from private modules, `core::iter::traits::iterator::Iterator`
     use std::iter::Iterator;

src/tools/clippy/tests/ui/std_instead_of_core.stderr

@@ -49,6 +49,12 @@ error: used import from `std` instead of `core`
 LL |     let cell_absolute = ::std::cell::Cell::new(8u32);
    |                           ^^^ help: consider importing the item from `core`: `core`
 
+error: used import from `std` instead of `core`
+  --> tests/ui/std_instead_of_core.rs:48:9
+   |
+LL |     use std::error::Error;
+   |         ^^^ help: consider importing the item from `core`: `core`
+
 error: used import from `std` instead of `core`
   --> tests/ui/std_instead_of_core.rs:52:9
    |
@@ -79,5 +85,5 @@ LL |     use alloc::slice::from_ref;
    = note: `-D clippy::alloc-instead-of-core` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::alloc_instead_of_core)]`
 
-error: aborting due to 12 previous errors
+error: aborting due to 13 previous errors