Hi,
The following code results in an error:
| tree | tree := BTree new. 1 to: 15 do: [:i | tree at: i put: i]. 1 to: 15 do: [:i | tree removeKey: i]
I first discovered it with Collections-BTree-avi.38 under Jasmine, and verified that it also happens with Collections-BTree-avi.42 under Squeak-3.7-5989-full.
Thanks, Josh