Alex Lam S.L 8a8a94a596 fix deep cloning of labels (#1565) ...

`AST_Label.references` get `.initialize()` to `[]` every time after `.clone()`

So walk down the tree to pick up the cloned `AST_LoopControl` pieces and put it back together.

2017-03-07 18:38:27 +08:00

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