cont.c: append to continuations doc [ci skip]

* cont.c (rb_callcc): [DOC] append continuations example accros
  methods.  [Fix GH-1026]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51906 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sun Sep 20 10:07:35 2015  Anton Davydov  <antondavydov.o@gmail.com>
+
+	* cont.c (rb_callcc): [DOC] append continuations example accros
+	  methods.  [Fix GH-1026]
+
 Sun Sep 20 03:20:21 2015  Koichi Sasada  <ko1@atdot.net>
 
 	* iseq.c (rb_iseq_free): free rb_iseq_t::body::cc_entries.

cont.c

@@ -893,6 +893,24 @@ cont_restore_0(rb_context_t *cont, VALUE *addr_in_prev_frame)
  *     Ron
  *     Max
  *
+ *  Also you can call callcc in other methods:
+ *
+ *     require "continuation"
+ *
+ *     def g
+ *       arr = [ "Freddie", "Herbie", "Ron", "Max", "Ringo" ]
+ *       cc = callcc { |cc| cc }
+ *       puts arr.shift
+ *       return cc, arr.size
+ *     end
+ *
+ *     def f
+ *       c, size = g
+ *       c.call(c) if size > 1
+ *     end
+ *
+ *     f
+ *
  *  This (somewhat contrived) example allows the inner loop to abandon
  *  processing early:
  *