review: refactor(SpoonifierVisitor): `Deque` should be used instead of `Stack` · INRIA/spoon@993d5a9

The number of problems exceeds the failThreshold

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Method invocation `get` may produce `NullPointerException`

Method invocation `keySet` may produce `NullPointerException`

Method invocation `put` may produce `NullPointerException`

Method invocation `get` may produce `NullPointerException`

Method invocation `isEmpty` may produce `NullPointerException`

Method invocation `containsKey` may produce `NullPointerException`

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