Rollup merge of #113441 - RalfJung:assign-no-overlap, r=oli-obk

miri: check that assignments do not self-overlap

r? `````@oli-obk`````

Author: compiler-errors

tests/fail/overlapping_assignment.rs

@@ -0,0 +1,23 @@
+#![feature(core_intrinsics)]
+#![feature(custom_mir)]
+
+use std::intrinsics::mir::*;
+
+// It's not that easy to fool the MIR validity check
+// which wants to prevent overlapping assignments...
+// So we use two separate pointer arguments, and then arrange for them to alias.
+#[custom_mir(dialect = "runtime", phase = "optimized")]
+pub fn self_copy(ptr1: *mut [i32; 4], ptr2: *mut [i32; 4]) {
+    mir! {
+        {
+            *ptr1 = *ptr2; //~ERROR: overlapping ranges
+            Return()
+        }
+    }
+}
+
+pub fn main() {
+    let mut x = [0; 4];
+    let ptr = std::ptr::addr_of_mut!(x);
+    self_copy(ptr, ptr);
+}

tests/fail/overlapping_assignment.stderr

@@ -0,0 +1,20 @@
+error: Undefined Behavior: `copy_nonoverlapping` called on overlapping ranges
+  --> $DIR/overlapping_assignment.rs:LL:CC
+   |
+LL |             *ptr1 = *ptr2;
+   |             ^^^^^^^^^^^^^ `copy_nonoverlapping` called on overlapping ranges
+   |
+   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
+   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
+   = note: BACKTRACE:
+   = note: inside `self_copy` at $DIR/overlapping_assignment.rs:LL:CC
+note: inside `main`
+  --> $DIR/overlapping_assignment.rs:LL:CC
+   |
+LL |     self_copy(ptr, ptr);
+   |     ^^^^^^^^^^^^^^^^^^^
+
+note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
+
+error: aborting due to previous error
+