samuel	2018-12-28 22:03:14 +0900 (Fri, 28 Dec 2018)

  New Revision: 66611

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66611

  Log:
    Don't allow rb_fiber_resume to raise exception on unborn fiber.

  Modified files:
    trunk/cont.c
    trunk/test/ruby/test_fiber.rb
Index: cont.c
===================================================================
--- cont.c	(revision 66610)
+++ cont.c	(revision 66611)
@@ -1896,9 +1896,14 @@ rb_fiber_resume(VALUE fibval, int argc, https://github.com/ruby/ruby/blob/trunk/cont.c#L1896
 {
     rb_fiber_t *fib = fiber_ptr(fibval);
 
+    if (argc == -1 && FIBER_CREATED_P(fib)) {
+        rb_raise(rb_eFiberError, "cannot raise exception on unborn fiber");
+    }
+
     if (fib->prev != 0 || fiber_is_root_p(fib)) {
 	rb_raise(rb_eFiberError, "double resume");
     }
+
     if (fib->transferred != 0) {
 	rb_raise(rb_eFiberError, "cannot resume transferred Fiber");
     }
Index: test/ruby/test_fiber.rb
===================================================================
--- test/ruby/test_fiber.rb	(revision 66610)
+++ test/ruby/test_fiber.rb	(revision 66611)
@@ -144,6 +144,7 @@ class TestFiber < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_fiber.rb#L144
     }
     assert_raise(RuntimeError){
       fib = Fiber.new{ Fiber.yield }
+      fib.resume
       fib.raise "raise and propagate"
     }
     assert_nothing_raised{

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