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Missing a cast to fold to the right type.

	The length of an array should always be converted to the
	type used for indexing.

	Fixes #31

--- a/mi/fold.c

+++ b/mi/fold.c

@@ -216,8 +216,10 @@

 	case Omemb:

 		t = tybase(exprtype(args[0]));

 		/* we only fold lengths right now */

-		if (t->type == Tyarray && !strcmp(namestr(args[1]), "len"))

-			r = t->asize;

+		if (t->type == Tyarray && !strcmp(namestr(args[1]), "len")) {

+			r = mkexpr(n->loc, Ocast, t->asize);

+			r->expr.type = exprtype(n);

+		}

 		break;

 	case Oarr:

 		qsort(n->expr.args, n->expr.nargs, sizeof(Node*), idxcmp);