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Node.prettily() method in parsimonious is broken

Node.prettily() method in parsimonious is broken: a task in harbor-swesmith-rl-artifacts: Harbor SWE-Smith 强化学习数据产物 (Harbor dataset). I found a bug in the Node.prettily() method in parsimonious. The method is supposed to return a pretty-printed representation of a parse tree, but it's not working…

The task

I found a bug in the `Node.prettily()` method in parsimonious. The method is supposed to return a pretty-printed representation of a parse tree, but it's not working correctly.

Part of keryszhan/harbor-swesmith-rl-artifacts.