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Promote expressions in ternary operator

All the expressions must be promoted before
of checking types, and in ternary operator we
will compare the types of the expressions in
some moment.

--- a/expr.c

+++ b/expr.c

@@ -659,9 +659,9 @@

 	cond = or();

 	while (accept('?')) {

-		ifyes = expr();

+		ifyes = promote(expr());

 		expect(':');

-		ifno = ternary();

+		ifno = promote(ternary());

 		/* TODO: check the types of ifno and ifyes */

 		cond = ternarycode(compare(ONE, cond, constcode(zero)),

 	                           ifyes, ifno);

-- 

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