[m-dev.] Syntactic sugar for functor matching

[Michael Day]

> It's not 100% backwards compatible, but I think it is compatible enough.
> The only incompatibility would be if someone was using '='/2 as a data
> constructor, and I think that is rare enough that we don't need to worry
> about it.

I use '='/2 in many places as a data constructor - it works well as a pair
functor for assoc_lists for example, and makes a nice syntax for
constructing XML attribute lists.

Michael


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