Auto merge of #82045 - Dylan-DPC:rollup-244l0sb, r=Dylan-DPC

Rollup of 10 pull requests

Successful merges:

 - #79775 (Fix injected errors when running doctests on a crate named after a keyword)
 - #81012 (Stabilize the partition_point feature)
 - #81479 (Allow casting mut array ref to mut ptr)
 - #81506 (HWAddressSanitizer support)
 - #81741 (Increment `self.index` before calling `Iterator::self.a.__iterator_ge…)
 - #81850 (use RWlock when accessing os::env)
 - #81911 (GAT/const_generics: Allow with_opt_const_param to return GAT param def_id)
 - #82022 (Push a `char` instead of a `str` with len one into a String)
 - #82023 (Remove unnecessary lint allow attrs on example)
 - #82030 (Use `Iterator::all` instead of open-coding it)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

2 files changed, 29 insertions, 7 deletions

diff --git a/src/test/ui/array-slice-vec/vector-cast-weirdness.rs b/src/test/ui/array-slice-vec/vector-cast-weirdness.rs
index 79b9243765b..e8f2c71477a 100644
--- a/src/test/ui/array-slice-vec/vector-cast-weirdness.rs
+++ b/src/test/ui/array-slice-vec/vector-cast-weirdness.rs
@@ -1,7 +1,11 @@
 // Issue #14893. Tests that casts from vectors don't behave strangely in the
 // presence of the `_` type shorthand notation.
+//
 // Update: after a change to the way casts are done, we have more type information
 // around and so the errors here are no longer exactly the same.
+//
+// Update: With PR #81479 some of the previously rejected cases are now allowed.
+// New test cases added.
 
 struct X {
     y: [u8; 2],
@@ -12,13 +16,19 @@ fn main() {
 
     // No longer a type mismatch - the `_` can be fully resolved by type inference.
     let p1: *const u8 = &x1.y as *const _;
+    let p1: *mut u8 = &x1.y as *mut _;
+    //~^ ERROR: casting `&[u8; 2]` as `*mut u8` is invalid
     let t1: *const [u8; 2] = &x1.y as *const _;
+    let t1: *mut [u8; 2] = &x1.y as *mut _;
+    //~^ ERROR: casting `&[u8; 2]` as `*mut [u8; 2]` is invalid
     let h1: *const [u8; 2] = &x1.y as *const [u8; 2];
+    let t1: *mut [u8; 2] = &x1.y as *mut [u8; 2];
+    //~^ ERROR: casting `&[u8; 2]` as `*mut [u8; 2]` is invalid
 
     let mut x1 = X { y: [0, 0] };
 
-    // This is still an error since we don't allow casts from &mut [T; n] to *mut T.
-    let p1: *mut u8 = &mut x1.y as *mut _;  //~ ERROR casting
+    let p1: *mut u8 = &mut x1.y as *mut _;
+    let p2: *const u8 = &mut x1.y as *const _;
     let t1: *mut [u8; 2] = &mut x1.y as *mut _;
     let h1: *mut [u8; 2] = &mut x1.y as *mut [u8; 2];
 }
diff --git a/src/test/ui/array-slice-vec/vector-cast-weirdness.stderr b/src/test/ui/array-slice-vec/vector-cast-weirdness.stderr
index 37055bb75f5..6fdb1ac9e30 100644
--- a/src/test/ui/array-slice-vec/vector-cast-weirdness.stderr
+++ b/src/test/ui/array-slice-vec/vector-cast-weirdness.stderr
@@ -1,9 +1,21 @@
-error[E0606]: casting `&mut [u8; 2]` as `*mut u8` is invalid
-  --> $DIR/vector-cast-weirdness.rs:21:23
+error[E0606]: casting `&[u8; 2]` as `*mut u8` is invalid
+  --> $DIR/vector-cast-weirdness.rs:19:23
    |
-LL |     let p1: *mut u8 = &mut x1.y as *mut _;
-   |                       ^^^^^^^^^^^^^^^^^^^
+LL |     let p1: *mut u8 = &x1.y as *mut _;
+   |                       ^^^^^^^^^^^^^^^
 
-error: aborting due to previous error
+error[E0606]: casting `&[u8; 2]` as `*mut [u8; 2]` is invalid
+  --> $DIR/vector-cast-weirdness.rs:22:28
+   |
+LL |     let t1: *mut [u8; 2] = &x1.y as *mut _;
+   |                            ^^^^^^^^^^^^^^^
+
+error[E0606]: casting `&[u8; 2]` as `*mut [u8; 2]` is invalid
+  --> $DIR/vector-cast-weirdness.rs:25:28
+   |
+LL |     let t1: *mut [u8; 2] = &x1.y as *mut [u8; 2];
+   |                            ^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 3 previous errors
 
 For more information about this error, try `rustc --explain E0606`.