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DstLayout::pad_to_align
is comparable toalloc::Layout::pad_to_align
, except that it additionally handles DSTs. This is the second of two steps needed forDstLayout
to support an API in the form of:(The first step was implementing
DstLayout::extend
in #633).Despite the similarities between
DstLayout::pad_to_align
andLayout::pad_to_align
, the former cannot be implemented in terms of the latter becauseLayout::pad_to_align
is notconst
. This introduces a risk that our computations here diverge from those inLayout::pad_to_align
, but this PR also includes Kani proofs thatDstLayout::pad_to_align
behaves comparably toLayout::pad_to_align
.Makes progress towards #29.