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Handle empty array sizes correctly.

	The size parameter *may* be null.

--- a/parse/infer.c

+++ b/parse/infer.c

@@ -2032,7 +2032,7 @@

 		if (t->type == Tyarray) {

 			typesub(t->asize, noerr);

 			t->asize = fold(t->asize, 1);

-			if (exprop(t->asize) != Olit)

+			if (t->asize && exprop(t->asize) != Olit)

 				fatal(t->asize, "nonconstant array size near %s\n", ctxstr(t->asize));

 		} else if (t->type == Tystruct) {

 			inaggr++;