+2013-10-02 Paul Eggert <eggert@cs.ucla.edu>
+
+ verify: new macro 'assume'
+ This is taken from Emacs, and should be generally useful.
+ * doc/verify.texi (assume): Document it.
+ * lib/verify.h (assume): New macro.
+ (__has_builtin): Expand to 0 if not defined.
+
2013-09-26 Eric Blake <eblake@redhat.com>
dup2, dup3: work around another cygwin crasher