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suppress warning in graphviz.c
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@@ -131,7 +131,7 @@ pgf_bracket_lzn_expr_literal(PgfLinFuncs** funcs, PgfLiteral lit)
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{
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PgfBracketLznState* state = gu_container(funcs, PgfBracketLznState, funcs);
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GuString label;
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GuString label = NULL;
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GuVariantInfo i = gu_variant_open(lit);
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switch (i.tag) {
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