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Eval expression before casting it

cast() only cannot deal with comparisions, so parameter expression
must be evaluated before casting it.

--- a/expr.c

+++ b/expr.c

@@ -509,7 +509,7 @@

 			next();

 			tp = typename();

 			expect(')');

-			np1 = cast();

+			np1 = eval(cast());

 			if ((np2 = convert(np1,  tp, 1)) == NULL)

 				error("bad type convertion requested");

 			np2->b.lvalue = np1->b.lvalue;