diff options
| -rw-r--r-- | library/core/src/intrinsics.rs | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/library/core/src/intrinsics.rs b/library/core/src/intrinsics.rs index dc82b32214c..6bf95a1b008 100644 --- a/library/core/src/intrinsics.rs +++ b/library/core/src/intrinsics.rs @@ -1212,8 +1212,9 @@ extern "rust-intrinsic" { /// /// `transmute` is semantically equivalent to a bitwise move of one type /// into another. It copies the bits from the source value into the - /// destination value, then forgets the original. It's equivalent to C's - /// `memcpy` under the hood, just like `transmute_copy`. + /// destination value, then forgets the original. Note that source and destination + /// are passed by-value, which means if `T` or `U` contains padding, that padding + /// might *not* be preserved by `transmute`. /// /// Because `transmute` is a by-value operation, alignment of the *transmuted values /// themselves* is not a concern. As with any other function, the compiler already ensures |