diff options
| -rw-r--r-- | src/libcore/mem/mod.rs | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/libcore/mem/mod.rs b/src/libcore/mem/mod.rs index 3fa2b7a2d04..7fcfbf10814 100644 --- a/src/libcore/mem/mod.rs +++ b/src/libcore/mem/mod.rs @@ -924,7 +924,12 @@ pub fn drop<T>(_x: T) {} #[inline] #[stable(feature = "rust1", since = "1.0.0")] pub unsafe fn transmute_copy<T, U>(src: &T) -> U { - ptr::read_unaligned(src as *const T as *const U) + // If U has a higher alignment requirement, src may not be suitably aligned. + if align_of::<U>() > align_of::<T>() { + ptr::read_unaligned(src as *const T as *const U) + } else { + ptr::read(src as *const T as *const U) + } } /// Opaque type representing the discriminant of an enum. |