Avoid enumerating closed response bodies

lib/protocol/rack/body/enumerable.rb

@@ -103,7 +103,7 @@ def close(error = nil)
 				# @yields {|chunk| ...}
 				# 	@parameter chunk [String] A chunk of the response body.
 				def each(&block)
-					@body.each(&block)
+					@body&.each(&block)
 				rescue => error
 					raise
 				ensure

releases.md

@@ -3,6 +3,7 @@
 ## Unreleased
 
   - Respect the result of rewinding the underlying request body.
+  - Avoid enumerating a response body after it has been closed.
 
 ## v0.22.1
 

test/protocol/rack/body/enumerable.rb

@@ -58,6 +58,16 @@
 				end
 			end.to raise_exception(RuntimeError, message: be =~ /Bad Enumerable/)
 		end
+
+		it "does not enumerate after being closed" do
+			body = subject.new(["Hello World"], 11)
+			body.close
+
+			chunks = []
+			body.each{|chunk| chunks << chunk}
+
+			expect(chunks).to be(:empty?)
+		end
 	end
 
 	with "#call" do