small assembler fix

lib/risc/assembler.rb

@@ -38,7 +38,7 @@ module Risc
         objekt.create_binary if objekt.is_a? Parfait::TypedMethod
         binary = objekt.binary
         Positioned.set_position(binary,at)
-        objekt.risc_instructions.set_position( at + 12) # BinaryCode header
+        objekt.cpu_instructions.set_position( at + 12) # BinaryCode header
         len = 4 * 14
         at += binary.padded_length
         nekst = binary.next

test/risc/test_assembler.rb

@@ -14,10 +14,9 @@ module Risc
       @assembler = Assembler.new(@machine , Collector.collect_space)
       assert @machine.translate_arm
     end
-
     def test_write_fails
       @assembler = Assembler.new(@machine , {})
-      assert_raises{ @assembler.assemble} #must translate first
+      assert_raises{ @assembler.write_as_string} #must translate first
     end
     def test_assemble_no_objects
       @assembler = Assembler.new(@machine , {})