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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I hit that mine too with my first implementation of pass1(), and was a little frustrated that the tree wasn't accepted and I had to refactor.
That said, and to be fair, the grammar for expression and term does define the order the tree should be built in, altough it could be a nice gesture to explicitly state the associativity in the description too.
But your tree does not seem to conform to the associativity described with the grammar syntax? The grammar does not allow for
expressionon the right.