Let Fiber#raise work with transferring fibers

This automatically choosess whether to use transfer on a transferring
fiber or resume on a yielding fiber.  If the fiber is resuming, it
raises a FiberError.

1 files changed, 25 insertions, 0 deletions

diff --git a/spec/ruby/core/fiber/raise_spec.rb b/spec/ruby/core/fiber/raise_spec.rb
index fd1cc911b5..f56219e565 100644
--- a/spec/ruby/core/fiber/raise_spec.rb
+++ b/spec/ruby/core/fiber/raise_spec.rb
@@ -73,4 +73,29 @@ ruby_version_is "2.7" do
       -> { fiber.resume }.should raise_error(FiberError, /dead fiber called|attempt to resume a terminated fiber/)
     end
   end
+
+end
+
+ruby_version_is "2.7"..."3.0" do
+  describe "Fiber#raise" do
+    it "raises a FiberError if invoked on a transferring Fiber" do
+      require "fiber"
+      root = Fiber.current
+      fiber = Fiber.new { root.transfer }
+      fiber.transfer
+      -> { fiber.raise }.should raise_error(FiberError, "cannot resume transferred Fiber")
+    end
+  end
+end
+
+ruby_version_is "3.0" do
+  describe "Fiber#raise" do
+    it "transfers and raises on a transferring fiber" do
+      require "fiber"
+      root = Fiber.current
+      fiber = Fiber.new { root.transfer }
+      fiber.transfer
+      -> { fiber.raise "msg" }.should raise_error(RuntimeError, "msg")
+    end
+  end
 end