From 4d51d7e42125ecfec94768cac77e67026574c6f8 Mon Sep 17 00:00:00 2001
From: herbelin
Date: Sun, 25 Jul 2010 22:17:43 +0000
Subject: Documentation of Set Automatic Coercions Import.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@13327 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 CHANGES                 |  3 ++-
 doc/refman/Coercion.tex | 23 +++++++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/CHANGES b/CHANGES
index e43228ef31..d78cd0c960 100644
--- a/CHANGES
+++ b/CHANGES
@@ -131,7 +131,8 @@ Module system
 - A functor application can be prefixed by a "!" to make it ignore any
   "Inline" annotation in the type of its argument(s) (for examples of
   use of the new features, see libraries Structures and Numbers).
-- Coercions are now active only when modules are imported.
+- Coercions are now active only when modules are imported (use "Set Automatic
+  Coercions Import" to get the behavior of the previous versions of Coq).
 
 Extraction
 
diff --git a/doc/refman/Coercion.tex b/doc/refman/Coercion.tex
index 4f3d3ec41e..3b6c949bae 100644
--- a/doc/refman/Coercion.tex
+++ b/doc/refman/Coercion.tex
@@ -367,6 +367,29 @@ Coercions with a local source class or a local target class, and
 coercions which do not verify the uniform inheritance condition any longer
 are also forgotten.
 
+\asection{Coercions and Modules}
+\index{Coercions!and modules}
+
+From Coq version 8.3, the coercions present in a module are activated
+only when the module is explicitly imported. Formerly, the coercions
+were activated as soon as the module was required, whatever it was
+imported or not.
+
+To recover the behavior of the versions of Coq prior to 8.3, use the
+following command:
+
+\comindex{Set Automatic Coercions Import}
+\comindex{Unset Automatic Coercions Import}
+\begin{verbatim}
+Set Automatic Coercions Import.
+\end{verbatim}
+
+To cancel the effect of the option, use instead:
+
+\begin{verbatim}
+Unset Automatic Coercions Import.
+\end{verbatim}
+
 \asection{Examples}
 
   There are three situations:
-- 
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