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| author | Mazdak Farrokhzad <twingoow@gmail.com> | 2019-12-22 02:40:07 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2019-12-22 02:40:07 +0100 |
| commit | ca528fcc046aca3e1cccb74a4bbebe855df3e3b6 (patch) | |
| tree | 3500405d97633983e4fa3013a7d95e39bdecd74a /src/liballoc/rc.rs | |
| parent | c35546383f89aa7255679f40094c9ad113c63dd6 (diff) | |
| parent | a34c2677afeee2747d680536f302a8c5665a65f4 (diff) | |
| download | rust-ca528fcc046aca3e1cccb74a4bbebe855df3e3b6.tar.gz rust-ca528fcc046aca3e1cccb74a4bbebe855df3e3b6.zip | |
Rollup merge of #67504 - Mark-Simulacrum:note-data-offset, r=Centril
Warn against relying on ?Sized being last Fixes #62522
Diffstat (limited to 'src/liballoc/rc.rs')
| -rw-r--r-- | src/liballoc/rc.rs | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/liballoc/rc.rs b/src/liballoc/rc.rs index 9046403e907..fd266210519 100644 --- a/src/liballoc/rc.rs +++ b/src/liballoc/rc.rs @@ -2106,6 +2106,8 @@ impl<T: ?Sized> Unpin for Rc<T> { } unsafe fn data_offset<T: ?Sized>(ptr: *const T) -> isize { // Align the unsized value to the end of the `RcBox`. // Because it is ?Sized, it will always be the last field in memory. + // Note: This is a detail of the current implementation of the compiler, + // and is not a guaranteed language detail. Do not rely on it outside of std. data_offset_align(align_of_val(&*ptr)) } |