bug: transmute::<*const T, Option<Box<T>>>(..)

tests/compile-fail/bugs/option_box_transmute_ptr.rs

@@ -0,0 +1,13 @@
+#![feature(custom_attribute)]
+#![allow(dead_code, unused_attributes)]
+
+#[miri_run]
+fn option_box_deref() -> i32 {
+    let val = Some(Box::new(42));
+    unsafe {
+        let ptr: *const i32 = std::mem::transmute(val); //~ ERROR: pointer offset outside bounds of allocation
+        *ptr
+    }
+}
+
+fn main() {}