patch 8.0.0020
Problem: The regexp engines are not reentrant.
Solution: Add regexec_T and save/restore the state when needed.
diff --git a/runtime/doc/change.txt b/runtime/doc/change.txt
index 51e699b..6dced7b 100644
--- a/runtime/doc/change.txt
+++ b/runtime/doc/change.txt
@@ -1,4 +1,4 @@
-*change.txt* For Vim version 8.0. Last change: 2016 Sep 11
+*change.txt* For Vim version 8.0. Last change: 2016 Oct 02
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -913,8 +913,7 @@
Substitute with an expression *sub-replace-expression*
*sub-replace-\=* *s/\=*
When the substitute string starts with "\=" the remainder is interpreted as an
-expression. This does not work recursively: a |substitute()| function inside
-the expression cannot use "\=" for the substitute string.
+expression.
The special meaning for characters as mentioned at |sub-replace-special| does
not apply except for "<CR>". A <NL> character is used as a line break, you