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-rw-r--r--doc/refman/RefMan-tac.tex10
1 files changed, 10 insertions, 0 deletions
diff --git a/doc/refman/RefMan-tac.tex b/doc/refman/RefMan-tac.tex
index c1d6b1d0c9..3f9f03c40f 100644
--- a/doc/refman/RefMan-tac.tex
+++ b/doc/refman/RefMan-tac.tex
@@ -989,6 +989,16 @@ Assumptions} (see Section~\ref{PrintAssumptions}). Admitted subgoals
have names of the form {\ident}\texttt{\_admitted} possibly followed
by a number.
+\subsection{\tt is\_evar \term
+\tacindex{is\_evar}
+\label{isevar}}
+
+This tactic applies to any goal. It checks whether its argument is an
+existential variable. Existential variables are uninstantiated
+variables generated by e.g. {\tt eapply} (see Section~\ref{apply}).
+
+\ErrMsg \errindex{Not an evar}
+
\subsection{Bindings list
\index{Binding list}
\label{Binding-list}}