Revert "Implement Binding#local_variables and Binding#receiver"

This reverts commit 25a735a.

See my notes at #3352.

Author: Yorick Peterse

kernel/common/binding.rb

@@ -54,12 +54,4 @@ def eval(expr, filename=nil, lineno=nil)
 
     Kernel.eval(expr, self, filename, lineno)
   end
-
-  def local_variables
-    eval('local_variables')
-  end
-
-  def receiver
-    @self
-  end
 end

spec/tags/ruby/core/binding/local_variables_tags.txt

@@ -0,0 +1,5 @@
+fails:Binding#local_variables returns an Array
+fails:Binding#local_variables includes local variables in the current scope
+fails:Binding#local_variables includes local variables defined after calling binding.local_variables
+fails:Binding#local_variables includes local variables of inherited scopes and eval'ed context
+fails:Binding#local_variables includes shadowed local variables only once

spec/tags/ruby/core/binding/receiver_tags.txt

@@ -0,0 +1 @@
+fails:Binding#receiver returns the object to which binding is bound