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<p>
Alternative patterns can be given for a case clause using the
<code>|</code> operator. If any of the patterns match then the clause matches.
</p>
<p>
When matching on multiple subjects there must be the same number of patterns
as there are subjects. Try removing one of the <code>_,</code> sub-patterns to
see the compile time error that is returned.
</p>
<p>
If a pattern defines a variable then all of the alternative patterns for that
clause must also define a variable with the same name and same type.
</p>
<p>
Currently it is not possible to have nested alternative patterns, so the
pattern <code>[1 | 2 | 3]</code> is not valid.
</p>
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