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[wip] UnalignUnsized #1828

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[wip] UnalignUnsized #1828

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Commits on Nov 14, 2024

  1. Add initial support for unsized MaybeUninit wrapper type 

    This is achieved by adding a `MaybeUninit` associated type to
`KnownLayout`, whose layout is identical to `Self` except that it admits
uninitialized bytes in all positions.

For sized types, this is bound to `mem::MaybeUninit<Self>`. For
potentially unsized structs, we synthesize a doppelganger with the same
`repr`, whose leading fields are wrapped in `mem::MaybeUninit` and whose
trailing field is the `MaybeUninit` associated type of struct's original
trailing field type. This type-level recursion bottoms out at `[T]`,
whose `MaybeUninit` associated type is bound to `[mem::MaybeUninit<T>]`.

Makes progress towards #1797
    @jswrenn
    jswrenn committed Nov 14, 2024
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  2. [wip] UnalignUnsized

    @jswrenn
    jswrenn committed Nov 14, 2024
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