Feature #8614: Object#singleton_class with a block

[Tsuyoshi Sawada]

=begin
Most of the time when I use Object#singleton_class, I use it with class_eval following it, like follows:

class Foo
  singleton_class.class_eval{attr_accessor :bar}
end

I think it would be convenient if Object#singleton_class can optionally take a block so that the following will mean the same as above.

class Foo
  singleton_class{attr_accessor :bar}
end

=end

[Elliot Winkler]

I'm not sure I like this, but I do agree about the use case. What about adding a method singleton_class_eval instead?