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handle nonExist in parse the tree visualization and reclaim memory
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@@ -28,6 +28,8 @@ class PGF_INTERNAL_DECL PgfLinearizationGraphvizOutput : public PgfLinearization
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PgfText *meta;
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bool nonexist;
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void generate_graphviz_level(PgfPrinter *printer, PgfGraphvizOptions* opts, ParseLevel *level);
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public:
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