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Not all arrays have defined sizes.

--- a/parse/infer.c

+++ b/parse/infer.c

@@ -2221,7 +2221,7 @@

 		case Tyarray:

 			if (t->type == Tyarray && t->asize)

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

-			if (getintlit(t->asize, &val) && val < 0)

+			if (t->asize && getintlit(t->asize, &val) && val < 0)

 				fatal(t->asize, "negative array size %lld\n", val);

 			typesub(t->asize, noerr);

 			break;