public void dumpExpression(TabbedPrintWriter writer)
			throws java.io.IOException {
		/*
		 * There are special cases where a cast isn't allowed. We must cast to
		 * the common super type before. In these cases instanceof always return
		 * false, but we want to decompile even bad programs.
		 */
		Type superType = instanceType
				.getCastHelper(subExpressions[0].getType());
		if (superType != null) {
			writer.startOp(writer.IMPL_PAREN, 2);
			writer.print("(");
			writer.printType(superType);
			writer.print(") ");
			writer.breakOp();
			subExpressions[0].dumpExpression(writer, 700);
			writer.endOp();
		} else
			subExpressions[0].dumpExpression(writer, 550);
		writer.breakOp();
		writer.print(" instanceof ");
		writer.printType(instanceType);
	}