[mercury-users] this appears to be a mixin

[Richard A. O'Keefe]

What is a mixin class?  The term comes from the old "Flavors"
system for Lisp, and refers to American ice-cream vending
practices.  A mixin is a class that adds features (in this
it is very very different from a Java interface, which CAN'T
provide implementations, the whole point of a mixin is to
do just that) but cannot stand by itself.  A concrete class
must have at least one ancestor that is not a mixin class.
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