Can lifetimes affect layouts?

[jbe]

I had a similar error, but in the context of GATs, recently:

@jbe

Error:

error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
   --> src/lib.rs:930:16
    |
930 |               Ok(std::mem::transmute::<
    |  ________________^
931 | |                 Option<V::AlignedRef<'_>>,
932 | |                 Option<V::AlignedRef<'b>>,
933 | |             >(result))
    | |_____________^
    |
    = note: `Option<<V as Storable>::AlignedRef>` does not have a fixed size

For more information about this error, try `rustc --explain E0512`.

However, I would argue that the two types V::AlignedRef<'lt> and V::AlignedRef<'b> would always have the same size.