let check return and assert in main test

so one can better locale the error
(the assert in the helper does not give stack trace)
a shot at keeping the calling handshake out of the asserts failed

test/typed/method_compiler/helper.rb

@@ -29,8 +29,13 @@ module Register
       Register.machine.boot # force boot to reset main
     end
 
-
-    def check
+    def preamble
+      [Label, SlotToReg , LoadConstant, RegToSlot, LoadConstant,RegToSlot, LoadConstant, SlotToReg, SlotToReg ]
+    end
+    def postamble
+      [ Label, FunctionReturn]
+    end
+    def check_nil
       assert @expect , "No output given"
       compiler = Typed::MethodCompiler.new
       code = Typed.ast_to_code( @input )
@@ -38,25 +43,33 @@ module Register
       produced = compiler.process( code )
       produced = Parfait.object_space.get_main.instructions
       compare_instructions produced , @expect
-      produced
+    end
+    def check_return
+      was = check_nil
+      raise was if was
+      Parfait.object_space.get_main.instructions
     end
 
-    def compare_instructions instruction , expect
+    def compare_instructions( instruction , expect )
       index = 0
-      start = instruction
+      all = instruction.to_arr
+      full_expect = preamble + expect + postamble
+      full_expect =  expect
       begin
-        should = expect[index]
-        assert should , "No instruction at #{index}"
-        assert_equal instruction.class , should , "Expected at #{index+1}\n#{should(start)}"
+        should = full_expect[index]
+        return "No instruction at #{index}" unless should
+        return "Expected at #{index+1}\n#{should(all)}" unless instruction.class == should
         index += 1
         instruction = instruction.next
       end while( instruction )
+      nil
     end
-    def should start
-      str = start.to_ac.to_s
-      str.gsub!("Register::","")
+    def should( all )
+      #preamble.each {all.shift}
+      #postamble.each {all.pop}
+      str = all.to_s.gsub("Register::","")
       ret = ""
-      str.split(",").each_slice(7).each do |line|
+      str.split(",").each_slice(6).each do |line|
         ret += "                " + line.join(",") + " ,\n"
       end
       ret