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I'm following the exercises from Ruby Koans and in about_proxy_object_project.rb there's this bit of code:
class Proxy
def initialize(target_object)
@object = target_object
end
# This method was added by me
def method_missing(method_name, *args, &block)
@object.send method_name
end
end
That gets called like this:
def test_tv_methods_still_perform_their_function
tv = Proxy.new(Television.new) # Television is a class with a :channel attr_accessor and a power method
tv.channel = 10
tv.power
assert_equal 10, tv.channel
assert tv.on?
end
The problem is that the line tv.channel = 10 is "breaking" the interpreter and throwing:
[BUG] Stack consistency error (sp: 53, bp: 54)
ruby 2.0.0p0
(...)
full stack trace follows
I've tried the same code with Ruby 1.9.3 and it's working. I'm using Ruby 2.0.0-p195.
So, is this an error/bug? Or I'm doing something horribly wrong?
887
What’s an error in Ruby ? As Ruby is a fully object-oriented language, an error is an instance of a class that includes the Exception class in its ancestor chain irb> RuntimeError.ancestors.include?
This can be done automatically by Ruby or manually. Catch and Throw is similar raise and rescue keywords, Exceptions can also be handled using catch and throw keywords in Ruby. Throw keyword generates an exception and whenever it is met, the program control goes to the catch statement.
Catch and Throw is similar raise and rescue keywords, Exceptions can also be handled using catch and throw keywords in Ruby. Throw keyword generates an exception and whenever it is met, the program control goes to the catch statement. The catch block is used to jump out from the nested block and the block is labeled with a name.
The Kernel#raise method is in charge of raising errors in Ruby In the first call to Kernel#raise, we can see that the method raises a RuntimeError — as no error class is explicitly specified as argument.
Yes. It is a Ruby bug in ruby 2.0.0p195 (2013-05-14 revision 40734) [x86_64-linux]. At the end of the stack trace, it says:
[NOTE]
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html
You should report this to Ruby core. Please do so for the sake of the Ruby community.
As pointed out by matt, it is fixed in Ruby 2.0.0p247.
I don't see you doing anything wrong.
95
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