rubinius_macros_patch.txt

diff --git a/kernel/loader.rb b/kernel/loader.rb
index 514453d..767820e 100644
--- a/kernel/loader.rb
+++ b/kernel/loader.rb
@@ -241,14 +241,9 @@ containing the Rubinius standard library files.
 
       options.on "-c", "FILE", "Check the syntax of FILE" do |file|
         if File.exists?(file)
-          case
-          when Rubinius.ruby18?
-            parser = Rubinius::Melbourne
-          when Rubinius.ruby19?
-            parser = Rubinius::Melbourne19
-          when Rubinius.ruby20?
-            parser = Rubinius::Melbourne20
-          else
+          parser = Rubinius::Compiler.default_compiler
+
+          unless parser
             raise "no parser available for this ruby version"
           end
 
diff --git a/lib/compiler/stages.rb b/lib/compiler/stages.rb
index 9505c96..a2e216b 100644
--- a/lib/compiler/stages.rb
+++ b/lib/compiler/stages.rb
@@ -2,6 +2,23 @@ module Rubinius
   class Compiler
     Stages = { }
 
+    def self.default_processor
+      @default_processor ||= case
+      when Rubinius.ruby18?
+        Rubinius::Melbourne
+      when Rubinius.ruby19?
+        Rubinius::Melbourne19
+      when Rubinius.ruby20?
+        Rubinius::Melbourne20
+      else
+        raise Exception, "no processor is defined for Parser compiler stage."
+      end
+    end
+
+    def self.default_processor=(processor)
+      @default_processor = processor
+    end
+
     class Stage
       attr_accessor :next_stage, :printer
 
@@ -163,16 +180,12 @@ module Rubinius
         compiler.parser = self
         @transforms = []
 
-        case
-        when Rubinius.ruby18?
-          @processor = Rubinius::Melbourne
-        when Rubinius.ruby19?
-          @processor = Rubinius::Melbourne19
-        when Rubinius.ruby20?
-          @processor = Rubinius::Melbourne20
-        else
+        @processor = Rubinius::Compiler.default_processor
+
+        unless @processor
           raise Exception, "no processor is defined for Parser compiler stage."
         end
+
       end
 
       def root(klass)