first propper hoisting test

had to change course, normalising and object creation is not possible
in one go
have to now generate random tmp vars  that will have to be picked up
later (sorted by tmp_ prefix?)

test/vool/ruby_compiler/test_class_statement.rb

@@ -30,9 +30,8 @@ module Vool
     include CompilerHelper
 
     def test_compile_one_method
-      lst = RubyCompiler.compile( in_Test("@ivar") )
-      assert_equal ScopeStatement , lst.body.class
-      assert_equal InstanceVariable , lst.body.statements.first.class
+      lst = RubyCompiler.compile( in_Test("@ivar = 4") )
+      assert_equal IvarAssignment , lst.body.class
     end
     def test_compile_two_methods
       lst = RubyCompiler.compile( in_Test("false; true;") )