So okay... I take it back.  Caml *does* have invariants.  (I'm 
learning.  Slowly.  But I'm learning.)

This "phantom types" design pattern is one I have never seen before.  It 
doesn't seem to be used in the standard library anywhere I can see.  It 
looks like it might be useful in presenting a safer network programming 
interface than the low-level wrappers around BSD sockets (which I've 
never liked).

Are there any other mind-blowingly elegant design patterns lurking in 
the corners of the Caml type inference engine that I should know about?


--
j h woodyatt <jhw@wetware.com>
"You're standing on sacred ground.  Many strange and wonderful
things have transpired right where you're standing."
                                               --unattributable

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