intrinsics: deprecate calling them via the unstable std::intrinsics path

Author: RalfJung

library/core/src/intrinsics/mod.rs

@@ -1909,7 +1909,11 @@ pub const fn forget<T: ?Sized>(_: T) {
 /// }
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_allowed_through_unstable_modules]
+#[cfg_attr(bootstrap, rustc_allowed_through_unstable_modules)]
+#[cfg_attr(
+    not(bootstrap),
+    rustc_allowed_through_unstable_modules = "import this function via `std::mem` instead"
+)]
 #[rustc_const_stable(feature = "const_transmute", since = "1.56.0")]
 #[rustc_diagnostic_item = "transmute"]
 #[rustc_nounwind]
@@ -4353,7 +4357,11 @@ pub const fn ptr_metadata<P: ptr::Pointee<Metadata = M> + ?Sized, M>(_ptr: *cons
 /// [`Vec::append`]: ../../std/vec/struct.Vec.html#method.append
 #[doc(alias = "memcpy")]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_allowed_through_unstable_modules]
+#[cfg_attr(bootstrap, rustc_allowed_through_unstable_modules)]
+#[cfg_attr(
+    not(bootstrap),
+    rustc_allowed_through_unstable_modules = "import this function via `std::mem` instead"
+)]
 #[rustc_const_stable(feature = "const_intrinsic_copy", since = "1.83.0")]
 #[inline(always)]
 #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
@@ -4457,7 +4465,11 @@ pub const unsafe fn copy_nonoverlapping<T>(src: *const T, dst: *mut T, count: us
 /// ```
 #[doc(alias = "memmove")]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_allowed_through_unstable_modules]
+#[cfg_attr(bootstrap, rustc_allowed_through_unstable_modules)]
+#[cfg_attr(
+    not(bootstrap),
+    rustc_allowed_through_unstable_modules = "import this function via `std::mem` instead"
+)]
 #[rustc_const_stable(feature = "const_intrinsic_copy", since = "1.83.0")]
 #[inline(always)]
 #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
@@ -4540,7 +4552,11 @@ pub const unsafe fn copy<T>(src: *const T, dst: *mut T, count: usize) {
 /// ```
 #[doc(alias = "memset")]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_allowed_through_unstable_modules]
+#[cfg_attr(bootstrap, rustc_allowed_through_unstable_modules)]
+#[cfg_attr(
+    not(bootstrap),
+    rustc_allowed_through_unstable_modules = "import this function via `std::mem` instead"
+)]
 #[rustc_const_stable(feature = "const_ptr_write", since = "1.83.0")]
 #[inline(always)]
 #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces

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

@@ -1,7 +1,7 @@
 //@aux-build:proc_macro_derive.rs
 
 #![warn(clippy::std_instead_of_core)]
-#![allow(unused_imports)]
+#![allow(unused_imports, deprecated)]
 
 extern crate alloc;
 

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

@@ -1,7 +1,7 @@
 //@aux-build:proc_macro_derive.rs
 
 #![warn(clippy::std_instead_of_core)]
-#![allow(unused_imports)]
+#![allow(unused_imports, deprecated)]
 
 extern crate alloc;
 

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

@@ -24,31 +24,31 @@ fn my_vec() -> MyVec<i32> {
 #[warn(clippy::useless_transmute)]
 unsafe fn _generic<'a, T, U: 'a>(t: &'a T) {
     // FIXME: should lint
-    // let _: &'a T = core::intrinsics::transmute(t);
+    // let _: &'a T = core::mem::transmute(t);
 
-    let _: &'a U = core::intrinsics::transmute(t);
+    let _: &'a U = core::mem::transmute(t);
 
-    let _: *const T = core::intrinsics::transmute(t);
+    let _: *const T = core::mem::transmute(t);
     //~^ ERROR: transmute from a reference to a pointer
     //~| NOTE: `-D clippy::useless-transmute` implied by `-D warnings`
 
-    let _: *mut T = core::intrinsics::transmute(t);
+    let _: *mut T = core::mem::transmute(t);
     //~^ ERROR: transmute from a reference to a pointer
 
-    let _: *const U = core::intrinsics::transmute(t);
+    let _: *const U = core::mem::transmute(t);
     //~^ ERROR: transmute from a reference to a pointer
 }
 
 #[warn(clippy::useless_transmute)]
 fn useless() {
     unsafe {
-        let _: Vec<i32> = core::intrinsics::transmute(my_vec());
+        let _: Vec<i32> = core::mem::transmute(my_vec());
         //~^ ERROR: transmute from a type (`std::vec::Vec<i32>`) to itself
 
         let _: Vec<i32> = core::mem::transmute(my_vec());
         //~^ ERROR: transmute from a type (`std::vec::Vec<i32>`) to itself
 
-        let _: Vec<i32> = std::intrinsics::transmute(my_vec());
+        let _: Vec<i32> = std::mem::transmute(my_vec());
         //~^ ERROR: transmute from a type (`std::vec::Vec<i32>`) to itself
 
         let _: Vec<i32> = std::mem::transmute(my_vec());
@@ -94,17 +94,17 @@ fn crosspointer() {
     let int_mut_ptr: *mut Usize = &mut int as *mut Usize;
 
     unsafe {
-        let _: Usize = core::intrinsics::transmute(int_const_ptr);
+        let _: Usize = core::mem::transmute(int_const_ptr);
         //~^ ERROR: transmute from a type (`*const Usize`) to the type that it points to (
         //~| NOTE: `-D clippy::crosspointer-transmute` implied by `-D warnings`
 
-        let _: Usize = core::intrinsics::transmute(int_mut_ptr);
+        let _: Usize = core::mem::transmute(int_mut_ptr);
         //~^ ERROR: transmute from a type (`*mut Usize`) to the type that it points to (`U
 
-        let _: *const Usize = core::intrinsics::transmute(my_int());
+        let _: *const Usize = core::mem::transmute(my_int());
         //~^ ERROR: transmute from a type (`Usize`) to a pointer to that type (`*const Usi
 
-        let _: *mut Usize = core::intrinsics::transmute(my_int());
+        let _: *mut Usize = core::mem::transmute(my_int());
         //~^ ERROR: transmute from a type (`Usize`) to a pointer to that type (`*mut Usize
     }
 }

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

@@ -1,29 +1,29 @@
 error: transmute from a reference to a pointer
   --> tests/ui/transmute.rs:31:23
    |
-LL |     let _: *const T = core::intrinsics::transmute(t);
-   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `t as *const T`
+LL |     let _: *const T = core::mem::transmute(t);
+   |                       ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `t as *const T`
    |
    = note: `-D clippy::useless-transmute` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::useless_transmute)]`
 
 error: transmute from a reference to a pointer
   --> tests/ui/transmute.rs:35:21
    |
-LL |     let _: *mut T = core::intrinsics::transmute(t);
-   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `t as *const T as *mut T`
+LL |     let _: *mut T = core::mem::transmute(t);
+   |                     ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `t as *const T as *mut T`
 
 error: transmute from a reference to a pointer
   --> tests/ui/transmute.rs:38:23
    |
-LL |     let _: *const U = core::intrinsics::transmute(t);
-   |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `t as *const T as *const U`
+LL |     let _: *const U = core::mem::transmute(t);
+   |                       ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `t as *const T as *const U`
 
 error: transmute from a type (`std::vec::Vec<i32>`) to itself
   --> tests/ui/transmute.rs:45:27
    |
-LL |         let _: Vec<i32> = core::intrinsics::transmute(my_vec());
-   |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |         let _: Vec<i32> = core::mem::transmute(my_vec());
+   |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: transmute from a type (`std::vec::Vec<i32>`) to itself
   --> tests/ui/transmute.rs:48:27
@@ -34,8 +34,8 @@ LL |         let _: Vec<i32> = core::mem::transmute(my_vec());
 error: transmute from a type (`std::vec::Vec<i32>`) to itself
   --> tests/ui/transmute.rs:51:27
    |
-LL |         let _: Vec<i32> = std::intrinsics::transmute(my_vec());
-   |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |         let _: Vec<i32> = std::mem::transmute(my_vec());
+   |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: transmute from a type (`std::vec::Vec<i32>`) to itself
   --> tests/ui/transmute.rs:54:27
@@ -64,29 +64,29 @@ LL |         let _: *const usize = std::mem::transmute(1 + 1usize);
 error: transmute from a type (`*const Usize`) to the type that it points to (`Usize`)
   --> tests/ui/transmute.rs:97:24
    |
-LL |         let _: Usize = core::intrinsics::transmute(int_const_ptr);
-   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |         let _: Usize = core::mem::transmute(int_const_ptr);
+   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D clippy::crosspointer-transmute` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::crosspointer_transmute)]`
 
 error: transmute from a type (`*mut Usize`) to the type that it points to (`Usize`)
   --> tests/ui/transmute.rs:101:24
    |
-LL |         let _: Usize = core::intrinsics::transmute(int_mut_ptr);
-   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |         let _: Usize = core::mem::transmute(int_mut_ptr);
+   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: transmute from a type (`Usize`) to a pointer to that type (`*const Usize`)
   --> tests/ui/transmute.rs:104:31
    |
-LL |         let _: *const Usize = core::intrinsics::transmute(my_int());
-   |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |         let _: *const Usize = core::mem::transmute(my_int());
+   |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: transmute from a type (`Usize`) to a pointer to that type (`*mut Usize`)
   --> tests/ui/transmute.rs:107:29
    |
-LL |         let _: *mut Usize = core::intrinsics::transmute(my_int());
-   |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |         let _: *mut Usize = core::mem::transmute(my_int());
+   |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: transmute from a `u8` to a `bool`
   --> tests/ui/transmute.rs:114:28

tests/ui/stability-attribute/accidental-stable-in-unstable.rs

@@ -8,3 +8,4 @@ use core::unicode::UNICODE_VERSION; //~ ERROR use of unstable library feature `u
 // Known accidental stabilizations with known users
 // fully stable @ core::mem::transmute
 use core::intrinsics::transmute; // depended upon by rand_core
+//~^WARN deprecated

tests/ui/stability-attribute/accidental-stable-in-unstable.stderr

@@ -7,6 +7,14 @@ LL | use core::unicode::UNICODE_VERSION;
    = help: add `#![feature(unicode_internals)]` to the crate attributes to enable
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
-error: aborting due to 1 previous error
+warning: use of deprecated module `std::intrinsics`: import this function via `std::mem` instead
+  --> $DIR/accidental-stable-in-unstable.rs:10:23
+   |
+LL | use core::intrinsics::transmute; // depended upon by rand_core
+   |                       ^^^^^^^^^
+   |
+   = note: `#[warn(deprecated)]` on by default
+
+error: aborting due to 1 previous error; 1 warning emitted
 
 For more information about this error, try `rustc --explain E0658`.