s := "x" ----> "x" s ||:= "x" ----> "xx" s ----> "xx" s := "x" ----> "x" s ||:= "xx" ----> "xxx" s ----> "xxx" s := "x" ----> "x" s ||:= "X" ----> "xX" s ----> "xX" s := "x" ----> "x" s ||:= "abc" ----> "xabc" s ----> "xabc" s := "x" ----> "x" s ==:= "x" ----> "x" s ----> "x" s := "x" ----> "x" s ==:= "xx" ----> none s ----> "x" s := "x" ----> "x" s ==:= "X" ----> none s ----> "x" s := "x" ----> "x" s ==:= "abc" ----> none s ----> "x" Run-time error 108 at line 33 in expr53.icn list expected offending value: "x"