bug: issue in self referencing struct

[greged93]

I am seeing an issue in the Kakarot RLP decoding step of the transaction. I can't really pinpoint the exact problem but basically what happens is:

• The value I pass to decode should decode to RLPItem::List([RLPItem::String(a), RLPItem::String(b), RLPItem::String(c)]). https://github.com/kkrt-labs/kakarot-ssj/blob/ecbbb90e718b68dcbff780af14f1acdbd517776d/crates/utils/src/rlp.cairo#L21
• When I try to decode the transaction in the decode function, all the inputs seem to be read correctly for each recursive call. https://github.com/kkrt-labs/kakarot-ssj/blob/ecbbb90e718b68dcbff780af14f1acdbd517776d/crates/utils/src/rlp.cairo#L167
• However, when printing the result, all I get are a bunch of RLPItem::String and the RLPItem::List seems to have disappeared.
• Additionally, each RLPItem::String should normally contain some value Span. When printing them, all values have a length of 0.

I don't know if this is linked but I wrote a very basic recursive program with a self referencing struct which compile and runs on the cairo-vm but crashes on native (see https://github.com/lambdaclass/cairo_native/pull/550).

Let me know if you need more information, I can try to provide whatever more you need.

[vibenedict]

Hi, i will like to take up this issue.

[edg-l]

This issue is fixed on main, the test is unignored there, closing!