From: Tim Becker <a2800276@...>
Date: 2006-12-29T19:50:18+09:00
Subject: case bug when comparing classes...?

Hi,
 I'm encountering weird behavior I don't understand when creating a
case expression that does comparison using classes. Consider the
following:

class SomeClass
end

def case_test elem
	case elem.class
		when Object
			puts "Object"
		when String
			puts "String"
		when SomeClass
			puts "SomeClass"
		else
			puts "Unknown: #{elem.class}"
	end
end

executing:

case_test Object.new
case_test "bla"
case_test SomeClass.new
case_test 1

yields:

Object
Object
Object
Object


On the other hand, running:

def if_test elem
	if Object == elem.class
		puts "Object"
	elsif String == elem.class
		puts "String"
	elsif SomeClass == elem.class
		puts "SomeClass"
	else
		puts "Unknown: #{elem.class}"
	end
end

if_test Object.new
if_test "bla"
if_test SomeClass.new
if_test 1


results in:

Object
String
SomeClass
Unknown: Fixnum

I've not been able to find anything that fits searching the bug
database or doing a rudimentary google search, and it would seem to me
that someone else would have come across this before.

Am I missing something?

Thanks,
   -tim

Oh and btw: ruby 1.8.5 (2006-08-25) [i686-darwin8.8.1]