2 files changed, 114 insertions, 0 deletions
diff --git a/tests/ui/lint/cast_ref_to_mut.rs b/tests/ui/lint/cast_ref_to_mut.rs
new file mode 100644
index 00000000000..745d7070143
--- /dev/null
+++ b/tests/ui/lint/cast_ref_to_mut.rs
@@ -0,0 +1,50 @@
+// check-fail
+
+#![feature(ptr_from_ref)]
+
+extern "C" {
+    // N.B., mutability can be easily incorrect in FFI calls -- as
+    // in C, the default is mutable pointers.
+    fn ffi(c: *mut u8);
+    fn int_ffi(c: *mut i32);
+}
+
+fn main() {
+    let s = String::from("Hello");
+    let a = &s;
+    unsafe {
+        let num = &3i32;
+        let mut_num = &mut 3i32;
+
+        (*(a as *const _ as *mut String)).push_str(" world");
+        //~^ ERROR casting `&T` to `&mut T` is undefined behavior
+        *(a as *const _ as *mut _) = String::from("Replaced");
+        //~^ ERROR casting `&T` to `&mut T` is undefined behavior
+        *(a as *const _ as *mut String) += " world";
+        //~^ ERROR casting `&T` to `&mut T` is undefined behavior
+        let _num = &mut *(num as *const i32 as *mut i32);
+        //~^ ERROR casting `&T` to `&mut T` is undefined behavior
+        let _num = &mut *(num as *const i32).cast_mut();
+        //~^ ERROR casting `&T` to `&mut T` is undefined behavior
+        let _num = *{ num as *const i32 }.cast_mut();
+        //~^ ERROR casting `&T` to `&mut T` is undefined behavior
+        *std::ptr::from_ref(num).cast_mut() += 1;
+        //~^ ERROR casting `&T` to `&mut T` is undefined behavior
+        *std::ptr::from_ref({ num }).cast_mut() += 1;
+        //~^ ERROR casting `&T` to `&mut T` is undefined behavior
+        *{ std::ptr::from_ref(num) }.cast_mut() += 1;
+        //~^ ERROR casting `&T` to `&mut T` is undefined behavior
+        *(std::ptr::from_ref({ num }) as *mut i32) += 1;
+        //~^ ERROR casting `&T` to `&mut T` is undefined behavior
+
+        // Shouldn't be warned against
+        println!("{}", *(num as *const _ as *const i16));
+        println!("{}", *(mut_num as *mut _ as *mut i16));
+        ffi(a.as_ptr() as *mut _);
+        int_ffi(num as *const _ as *mut _);
+        int_ffi(&3 as *const _ as *mut _);
+        let mut value = 3;
+        let value: *const i32 = &mut value;
+        *(value as *const i16 as *mut i16) = 42;
+    }
+}
diff --git a/tests/ui/lint/cast_ref_to_mut.stderr b/tests/ui/lint/cast_ref_to_mut.stderr
new file mode 100644
index 00000000000..baff00d6c04
--- /dev/null
+++ b/tests/ui/lint/cast_ref_to_mut.stderr
@@ -0,0 +1,64 @@
+error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
+  --> $DIR/cast_ref_to_mut.rs:19:9
+   |
+LL |         (*(a as *const _ as *mut String)).push_str(" world");
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[deny(cast_ref_to_mut)]` on by default
+
+error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
+  --> $DIR/cast_ref_to_mut.rs:21:9
+   |
+LL |         *(a as *const _ as *mut _) = String::from("Replaced");
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
+  --> $DIR/cast_ref_to_mut.rs:23:9
+   |
+LL |         *(a as *const _ as *mut String) += " world";
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
+  --> $DIR/cast_ref_to_mut.rs:25:25
+   |
+LL |         let _num = &mut *(num as *const i32 as *mut i32);
+   |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
+  --> $DIR/cast_ref_to_mut.rs:27:25
+   |
+LL |         let _num = &mut *(num as *const i32).cast_mut();
+   |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
+  --> $DIR/cast_ref_to_mut.rs:29:20
+   |
+LL |         let _num = *{ num as *const i32 }.cast_mut();
+   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
+  --> $DIR/cast_ref_to_mut.rs:31:9
+   |
+LL |         *std::ptr::from_ref(num).cast_mut() += 1;
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
+  --> $DIR/cast_ref_to_mut.rs:33:9
+   |
+LL |         *std::ptr::from_ref({ num }).cast_mut() += 1;
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
+  --> $DIR/cast_ref_to_mut.rs:35:9
+   |
+LL |         *{ std::ptr::from_ref(num) }.cast_mut() += 1;
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
+  --> $DIR/cast_ref_to_mut.rs:37:9
+   |
+LL |         *(std::ptr::from_ref({ num }) as *mut i32) += 1;
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 10 previous errors
+