Rollup merge of #124978 - saethlin:ref-casting_derefs, r=Urgau,Nilstrieb

Handle Deref expressions in invalid_reference_casting

Similar to https://github.com/rust-lang/rust/pull/124908

See https://github.com/rust-lang/rust/issues/124951 for context; this PR fixes the last of the known false postiive cases with this lint that we encounter in Crater.

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/ui/lint/reference_casting.rs b/tests/ui/lint/reference_casting.rs
index 87a682249b0..87fa42f9477 100644
--- a/tests/ui/lint/reference_casting.rs
+++ b/tests/ui/lint/reference_casting.rs
@@ -261,6 +261,13 @@ unsafe fn bigger_layout() {
         let ptr = r as *mut i32 as *mut Vec3<i32>;
         unsafe { *ptr = Vec3(0, 0, 0) }
     }
+
+    unsafe fn deref(v: &mut Vec3<i32>) {
+        let r = &mut v.0;
+        let r = &mut *r;
+        let ptr = &mut *(r as *mut i32 as *mut Vec3<i32>);
+        unsafe { *ptr = Vec3(0, 0, 0) }
+    }
 }
 
 const RAW_PTR: *mut u8 = 1 as *mut u8;