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--- libIDL/util.c
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+++ libIDL/util.c
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@@ -2542,7 +2542,7 @@ static gboolean IDL_output_delim_pre (ID
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 {
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 	if (IDL_output_delim_match (tfd, delim)) {
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 		if (delim->hit)
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-			dataf (delim->data, delim->delim);
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+			dataf (delim->data, "%s", delim->delim);
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 		else
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 			delim->hit = TRUE;
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 		return delim->pre_func