--- /dev/null
+// expected output
+#expect 1
+#expect 20
+
+#ship debug : Debug
+#ship fifo : Fifo
+
+debug.in:
+ setflags a=1, b=b;
+ [a] literal 1;
+ [!a] literal 0;
+ deliver;
+ literal 0;
+ literal 1;
+ setflags a=0, b=b;
+ nop;
+ [!a] literal 20;
+ deliver;
+