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This operator heads an expression that is being defined piecewise. Its
arguments are n objects built with the piece constructor, optionally
followed by one built with otherwise constructor.
This introduces an individual component of a piecewise definition. It has
precisely two arguments: the first is the value, and the second is a Boolean
(meant to be a predicate) which is true if and only if this piece is to
provide the value of the piecewise construct.
This symbol introduces the 'default' value of a piecewise construct.
If none of the previous piece constructs can provide the value, this will.
It has a single child, the value.
