generalize assemblers to use callables

not just methods,  they are almost the same anyway

test/mom/helper.rb

@@ -30,7 +30,7 @@ module Risc
     def produce_instructions
       assert @expect , "No output given"
       linker = RubyX::RubyXCompiler.new(as_test_main).ruby_to_risc(:interpreter)
-      compiler = linker.assemblers.find{|c| c.method.name == :main and c.method.self_type.object_class.name == :Test}
+      compiler = linker.assemblers.find{|c| c.callable.name == :main and c.callable.self_type.object_class.name == :Test}
       compiler.instructions
     end
     def check_nil

test/risc/test_linker1.rb

@@ -14,7 +14,7 @@ module Risc
       end
     end
     def test_one_main
-      mains = @linker.assemblers.find_all{|asm| asm.method.name == :main }
+      mains = @linker.assemblers.find_all{|asm| asm.callable.name == :main }
       assert_equal 1 , mains.length
     end
     def test_assembler_num

test/rubyx/test_rubyx_compiler2.rb

@@ -14,7 +14,7 @@ module RubyX
       assert_equal Risc::Linker , @linker.class
     end
     def test_method
-      assert_equal :main , @linker.assemblers.first.method.name
+      assert_equal :main , @linker.assemblers.first.callable.name
     end
   end
 end