These are the result of auditing (as of 0003184) for panic opportunities. Some have been left off which are either unavoidable, in progress of being removed (#1658), or downstream of ones listed here (namely, downstream of is_bit_valid).

validate_cast_and_convert_metadata

We should be able to make this work via a post-monomorphization error instead, and thus avoid a panic opportunity.

PointerMetadata::size_for_metadata

TryFromBytes::is_bit_valid

Now that const eval semantics are more nailed down, we can probably stop hedging that this might panic and just guarantee a post-monomorphization error.

Note that many panics are downstream of is_bit_valid. If we tackle this, we should make sure to remove panic documentation from all downstream functions.

round_down_to_next_multiple_of_alignment

We could benefit from a power-of-two witness type.