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c054ba6a97
This provides variable capture in standard situations: - nested functions - lambdas There are some deficiencies: - we do not yet handle objects capturing variables. - we do not handle variables captured via the `nonlocal` keyword. This should be solved at the AST level, though, and then it should "just work". There are still inconsistencies in the case where a `SynthesizedCaptureNode` has a comprehensions as its enclosing callable. In this case, `TFunction(cn.getEnclosingCallable())` is not defined and so getEnclosingCallable does not exist for the `CaptureNode`.