* cont.c (rb_fiber_resume): raise an "double resume" error when root

  fiber is going to be resumed.  [ruby-dev:42523]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29680 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/cont.c b/cont.c
index b0b3f41c7d..b0defcaeb7 100644
--- a/cont.c
+++ b/cont.c
@@ -1292,7 +1292,7 @@ rb_fiber_resume(VALUE fibval, int argc, VALUE *argv)
     rb_fiber_t *fib;
     GetFiberPtr(fibval, fib);
 
-    if (fib->prev != Qnil) {
+    if (fib->prev != Qnil || fib->cont.type == ROOT_FIBER_CONTEXT) {
 	rb_raise(rb_eFiberError, "double resume");
     }