How can I recreate this in CoBlocks?
repeat forever - block in CoBlocks has the same functionality as the
repeat infinity times block in Blockly. The CoBlocks variant is also less error-prone
You can find the
forever block in the Control -> Loops subcategory. Below you can find the CoBlocks implementation of your example:
position of item - expression block can be found in the Transform -> Position subcategory.
Hope this helps!