Bug #5914
closedCalling extend with an anonymous module requires use of parentheses
Description
=begin
Given Ruby 2.0.0dev, 1.9.3 or 1.8.7 and this code:
class Dude
def initialize
extend Module.new do
def hello
puts "Word!"
end
end
end
end
Dude.new.hello
No warning is given, but it does not behave how I expect and throws a NoMethodError.
However, if parentheses are used on the call to extend, things behave as expected:
class Dude
def initialize
extend(Module.new do
def hello
puts "Word!"
end
end)
end
end
Dude.new.hello
=> Word!
I don't understand what is happening in the first case (without parentheses). Is this a bug or a misunderstanding on my part?
=end
Files
Updated by funny_falcon (Yura Sokolov) almost 13 years ago
When you call without parentheses, then block do
is going to extend
method, but not Module.new
2012/1/20 Mark Somerville mark@scottishclimbs.com
Issue #5914 has been reported by Mark Somerville.
Bug #5914: Calling extend with an anonymous module requires use of
parentheses
https://bugs.ruby-lang.org/issues/5914Author: Mark Somerville
Status: Open
Priority: Normal
Assignee:
Category:
Target version:
ruby -v: 2.0.0dev=begin
Given Ruby 2.0.0dev, 1.9.3 or 1.8.7 and this code:
class Dude
def initialize
extend Module.new do
def hello
puts "Word!"
end
end
end
endDude.new.hello
No warning is given, but it does not behave how I expect and throws a
NoMethodError.However, if parentheses are used on the call to extend, things behave as
expected:class Dude
def initialize
extend(Module.new do
def hello
puts "Word!"
end
end)
end
endDude.new.hello
=> Word!I don't understand what is happening in the first case (without
parentheses). Is this a bug or a misunderstanding on my part?=end
Updated by Spakman (Mark Somerville) almost 13 years ago
On Fri, Jan 20, 2012 at 08:52:08PM +0900, Юрий Соколов wrote:
When you call without parentheses, then block
do
is going toextend
method, but notModule.new
Doh! That seems so obvious now that you have pointed it out.
Thanks a lot, it was really confusing me!
Updated by ko1 (Koichi Sasada) almost 13 years ago
- Status changed from Open to Rejected