Added tests for array/struct impl, but they in general require printing

to screen

test/arrays.c0

@@ -0,0 +1,12 @@
+#use <conio>
+
+int main() {
+  int[] A = alloc_array(int, -2);
+  A[3] = 0;
+  A[3] = 1;
+  A[3] = 2;
+  A[3] = 3;
+  
+  printint(A[3]);
+  return 0;
+}