Always report alignment failures in future incompat summaries

Author: oli-obk

compiler/rustc_lint_defs/src/builtin.rs

@@ -1052,6 +1052,7 @@ declare_lint! {
     "raw pointers must be aligned before dereferencing",
     @future_incompatible = FutureIncompatibleInfo {
         reference: "issue #68585 <https://github.com/rust-lang/rust/issues/104616>",
+        reason: FutureIncompatibilityReason::FutureReleaseErrorReportNow,
     };
 }
 

src/test/ui/consts/const-eval/ub-ref-ptr.32bit.stderr

@@ -168,3 +168,21 @@ LL |     ptr.read();
 error: aborting due to 15 previous errors
 
 For more information about this error, try `rustc --explain E0080`.
+Future incompatibility report: Future breakage diagnostic:
+error: accessing memory with alignment 1, but alignment 4 is required
+  --> $SRC_DIR/core/src/ptr/mod.rs:LL:COL
+   |
+   = note: inside `std::ptr::read::<u32>`
+  --> $SRC_DIR/core/src/ptr/const_ptr.rs:LL:COL
+   |
+   = note: inside `ptr::const_ptr::<impl *const u32>::read`
+   |
+  ::: $DIR/ub-ref-ptr.rs:65:5
+   |
+LL |     ptr.read();
+   |     ---------- inside `UNALIGNED_READ`
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #68585 <https://github.com/rust-lang/rust/issues/104616>
+   = note: `#[deny(invalid_alignment)]` on by default
+

src/test/ui/consts/const-eval/ub-ref-ptr.64bit.stderr

@@ -168,3 +168,21 @@ LL |     ptr.read();
 error: aborting due to 15 previous errors
 
 For more information about this error, try `rustc --explain E0080`.
+Future incompatibility report: Future breakage diagnostic:
+error: accessing memory with alignment 1, but alignment 4 is required
+  --> $SRC_DIR/core/src/ptr/mod.rs:LL:COL
+   |
+   = note: inside `std::ptr::read::<u32>`
+  --> $SRC_DIR/core/src/ptr/const_ptr.rs:LL:COL
+   |
+   = note: inside `ptr::const_ptr::<impl *const u32>::read`
+   |
+  ::: $DIR/ub-ref-ptr.rs:65:5
+   |
+LL |     ptr.read();
+   |     ---------- inside `UNALIGNED_READ`
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #68585 <https://github.com/rust-lang/rust/issues/104616>
+   = note: `#[deny(invalid_alignment)]` on by default
+