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\begin{center}\begin{minipage}{15cm}\begin{Verbatim}[frame=single]
> match exp(x) with
sin(x) : ("Sine of x")
atan(x^2) : ("Arctangent of square of x")
default : ("Something else")
exp(x) : ("Exponential of x");
Something else
>
> match atan(x^2) with
sin(x) : ("Sine of x")
atan(default^2) : ("Arctangent of the square of something")
default : ("Something else");
Arctangent of the square of something
>
> match atan(exp(x)^2) with
sin(x) : ("Sine of x")
atan(default^2) : ("Arctangent of the square of something")
default : ("Something else");
Arctangent of the square of something
>
> match exp("Hello world") with
exp(default) : ("A miracle has happened")
default : ("Something else");
Warning: at least one of the given expressions or a subexpression is not correct
ly typed
or its evaluation has failed because of some error on a side-effect.
error
\end{Verbatim}
\end{minipage}\end{center}
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