a bug of "plotode"?

[leprechaun]

Recently I thought about trouble like the above with assigned variables or somehow similar capital X in combination with home and cas commands.

Would it be an option to print the expression with replaced variables if an error occured? That would not make you save if your assigment yields a formally correct expression and just returns an 'incorrect' result. But if the calculator reports an error it could be really helpful to see, what expression was actually evaluated. ?