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Add Doubly Linked List example to tutorial #46

Closed elaustell closed 4 months ago

elaustell commented 4 months ago

I have spent a long time working out this example (with lots of help from @bcpierce00 and @septract). This problem is quite difficult because there are multiple pointers to each element of a doubly linked list, and this makes reasoning about ownership nontrivial. I am hoping that it will be a helpful addition to the tutorial.

elaustell commented 4 months ago

I see that the CI check failed, but under details it says it is failing on linear search, which I didn't touch... Everything passes locally for me.

septract commented 4 months ago

Linear search is returning code 124, which is a timeout - I would guess this is unrelated to your changes, and just reflects the stuff the Cambridge folks are changing in CN on the master branch

cp526 commented 4 months ago

Thanks very much!