Only add Builtin methods that are not in the current compilation

Current bug looks like the original main is used in parts
(not the compiled one, but the builtin on)

lib/mom/mom_compiler.rb

@@ -3,7 +3,12 @@ module Mom
     attr_reader :method_compilers
 
     def initialize(compilers = [])
-      @method_compilers = Risc::Builtin.boot_functions + compilers
+      @method_compilers = compilers
+      Risc::Builtin.boot_functions.each do |boot_comp|
+        next if @method_compilers.find{|comp| comp.method == boot_comp.method }        
+        @method_compilers << boot_comp
+      end
+
     end
 
     # collects constants from all compilers into one array

lib/parfait/typed_method.rb

@@ -32,6 +32,12 @@ module Parfait
       init(arguments_type, frame_type)
     end
 
+    def ==(other)
+      return false unless other.is_a?(TypedMethod)
+      return false if @name != other.name
+      @for_type == other.for_type
+    end
+
     # (re) init with given args and frame types
     def init(arguments_type, frame_type)
       raise "Wrong argument type, expect Type not #{arguments_type.class}" unless arguments_type.is_a? Type