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Added note about first-class-families #19

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2 changes: 2 additions & 0 deletions extensible-data.tex
Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,8 @@ \section{Open Sums}

\preamble{OpenSum}

Note: for the code examples in this section to work you will need to have \pkg{first-class-families}\cite{fcf} installed and added to your dependencies.

By definition, an open sum is a container of a data whose type isn't known
statically. Furthermore, there are no guarantees that we know which types it
\emph{might be,} since the list of types itself might be polymorphic.
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