From 262e3151ce483aaab3b4f60e3d1dbdf875ea05ae Mon Sep 17 00:00:00 2001
From: Hugo Herbelin
Date: Sun, 3 Aug 2014 19:18:21 +0200
Subject: Experimentally adding an option for automatically erasing an
 hypothesis when using it in apply or rewrite (prefix ">", undocumented), and
 a modifier to explicitly keep it in induction or destruct (prefix "!",
 reminiscent of non-linerarity).

Also added undocumented option "Set Default Clearing Used Hypotheses"
which makes apply and rewrite default to erasing the hypothesis they
use (if ever their argument is indeed an hypothesis of the context).
---
 doc/refman/RefMan-tac.tex | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'doc')

diff --git a/doc/refman/RefMan-tac.tex b/doc/refman/RefMan-tac.tex
index 28d854eaae..a3953bb968 100644
--- a/doc/refman/RefMan-tac.tex
+++ b/doc/refman/RefMan-tac.tex
@@ -1573,6 +1573,14 @@ syntax {\tt destruct ({\num})} (not very interesting anyway).
   They combine the effects of the {\tt with}, {\tt as}, {\tt eqn:}, {\tt using},
   and {\tt in} clauses.
 
+\item{\tt destruct !{\ident}}
+
+  This is a case when the destructed term is an hypothesis of the
+  context. The ``!'' modifier tells to keep the hypothesis in the
+  context after destruction.
+
+  This applies also to the other form of {\tt destruct} and {\tt edestruct}.
+
 \item{\tt case \term}\label{case}\tacindex{case}
 
   The tactic {\tt case} is a more basic tactic to perform case
@@ -1750,6 +1758,15 @@ induction n.
   einduction}.  It combines the effects of the {\tt with}, {\tt as},
   {\tt eqn:}, {\tt using}, and {\tt in} clauses.
 
+\item{\tt induction !{\ident}}
+
+  This is a case when the term on which to apply induction is an
+  hypothesis of the context. The ``!'' modifier tells to keep the
+  hypothesis in the context after induction.
+
+  This applies also to the other form of {\tt induction} and {\tt
+    einduction}.
+
 \item {\tt elim \term}\label{elim}
 
   This is a more basic induction tactic.  Again, the type of the
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