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-rw-r--r--test/examples/proofdefinefunction.tex4
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diff --git a/test/examples/proofdefinefunction.tex b/test/examples/proofdefinefunction.tex
index ac17d0b..0367a0d 100644
--- a/test/examples/proofdefinefunction.tex
+++ b/test/examples/proofdefinefunction.tex
@@ -1,3 +1,7 @@
+\begin{signature}\label{example_pair}
+ $(x,y)$ is a set.
+\end{signature}
+
% The builtin "-(-)" notation desugars to "\apply{-}{-}".
% This is just a dummy definition.
\begin{definition}\label{apply}