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pyflakes has traditionally recursed with a handler for every level of the ast. The ast depth can become very large, especially for an expression containing many binary operators. Python has a maximum recursion limit, defaulting to a low number like 1000, which resulted in a RuntimeError for the ast of: x = 1 + 2 + 3 + ... + 1001 This change avoids recursing for nodes that do not have a specific handler. Checker.nodeDepth and node.depth change from always being the ast depth, which varied based on Python version due to ast differences, to being the number of nested handlers within pyflakes.
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