Auto merge of #115583 - RalfJung:packed-unsized, r=lcnr #36726

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5 errors and 10 warnings

unexpected closing delimiter: `}`

this file contains an unclosed delimiter

unexpected closing delimiter: `}`

unexpected `if` in the condition expression

mismatched closing delimiter: `}`

ambiguous glob re-exports

field `next_col_index` is never read

unused return value of `Box::<T>::from_raw` that must be used

trait aliases are experimental

derive helper attribute is used before it is introduced