doc: document Fiber.current

It's always been supported (since it's just an eval), but make
it explicit.  We'll also drop the Actor.current example since
both Rubinius and Revactor seem dead and Ractor (Guild) is
probably coming...

1 files changed, 16 insertions, 0 deletions

diff --git a/test/test_clogger.rb b/test/test_clogger.rb
index b7dd4e9..1dee652 100644
--- a/test/test_clogger.rb
+++ b/test/test_clogger.rb
@@ -212,6 +212,22 @@ class TestClogger < Test::Unit::TestCase
     assert_equal "-#{current}-\n", str.string
   end
 
+  def test_fiber
+    begin
+      current = Fiber.current.to_s
+    rescue NameError => e
+      warn "your Ruby does not support fibers #{e}"
+      return
+    end
+    str = StringIO.new
+    app = lambda { |env| [ 302, {}, [] ] }
+    cl = Clogger.new(app,
+                    :logger => str,
+                    :format => "-$e{Fiber.current}-\n")
+    status, headers, body = cl.call(@req)
+    assert_equal "-#{current}-\n", str.string
+  end
+
   def test_pid
     str = StringIO.new
     app = lambda { |env| [ 302, {}, [] ] }