diff --git a/lib/asm/arm_assembler.rb b/lib/asm/arm_assembler.rb
index 42c08cf4..69b4ca3d 100644
--- a/lib/asm/arm_assembler.rb
+++ b/lib/asm/arm_assembler.rb
@@ -122,7 +122,7 @@ module Asm
 
     def assemble(io)
       @values.each do |obj|
-        obj.assemble io, self
+        obj.assemble io
       end
     end
 
diff --git a/lib/asm/call_instruction.rb b/lib/asm/call_instruction.rb
index 12cef595..40dac13d 100644
--- a/lib/asm/call_instruction.rb
+++ b/lib/asm/call_instruction.rb
@@ -8,7 +8,7 @@ module Asm
       super(opcode,args)
     end
     
-    def assemble(io, as)
+    def assemble(io)
       s = @update_status_flag? 1 : 0
       case opcode
       when :b, :bl
diff --git a/lib/asm/instruction.rb b/lib/asm/instruction.rb
index 48311540..cd3f067b 100644
--- a/lib/asm/instruction.rb
+++ b/lib/asm/instruction.rb
@@ -40,7 +40,7 @@ module Asm
       4
     end
     
-    def assemble(io, as)
+    def assemble(io)
       raise "Abstract class, should not be called/instantiated #{self.inspect}"
     end
   end
diff --git a/lib/asm/label.rb b/lib/asm/label.rb
index 857ec29c..f9caf2e3 100644
--- a/lib/asm/label.rb
+++ b/lib/asm/label.rb
@@ -2,7 +2,6 @@ module Asm
 
   class Label
     def initialize(name , asm)
-      @@oh = 1
       @name = name
       @asm = asm
       @position = nil
@@ -23,7 +22,7 @@ module Asm
       0
     end
 
-    def assemble(io, as)
+    def assemble(io)
       self.position = io.tell
     end
     def set!
diff --git a/lib/asm/logic_instruction.rb b/lib/asm/logic_instruction.rb
index 8e289db4..411cac11 100644
--- a/lib/asm/logic_instruction.rb
+++ b/lib/asm/logic_instruction.rb
@@ -69,7 +69,7 @@ module Asm
       end
     end
 
-    def assemble(io, as)
+    def assemble(io)
       build
       val = operand.is_a?(Register) ? operand.bits : operand 
       val |= (rd.bits <<            12) 
diff --git a/lib/asm/memory_instruction.rb b/lib/asm/memory_instruction.rb
index e4f03acd..93544e56 100644
--- a/lib/asm/memory_instruction.rb
+++ b/lib/asm/memory_instruction.rb
@@ -56,7 +56,7 @@ module Asm
       end
     end
 
-    def assemble(io, as)
+    def assemble(io)
       build
       #not sure about these 2 constants. They produce the correct output for str r0 , r1
       # but i can't help thinking that that is because they are not used in that instruction and
diff --git a/lib/asm/stack_instruction.rb b/lib/asm/stack_instruction.rb
index 706b3171..67d97b9b 100644
--- a/lib/asm/stack_instruction.rb
+++ b/lib/asm/stack_instruction.rb
@@ -26,7 +26,7 @@ module Asm
     attr_accessor :cond, :inst_class, :pre_post_index, :up_down,
                   :update_status_flag, :write_base, :is_pop, :rn, :operand
                   
-    def assemble(io, as)
+    def assemble(io)
       build
       cond = @cond.is_a?(Symbol) ?  COND_CODES[@cond]   : @cond
       rn = reg "sp" # sp register
diff --git a/lib/asm/string_literal.rb b/lib/asm/string_literal.rb
index 16e04189..c7bd7cd3 100644
--- a/lib/asm/string_literal.rb
+++ b/lib/asm/string_literal.rb
@@ -19,7 +19,7 @@ module Asm
     def length
       @string.length
     end
-    def assemble(io, as)
+    def assemble(io)
       io << @string
     end
   end
diff --git a/test/test_nodes.rb b/test/test_nodes.rb
index dc85d894..5d9a1d3c 100644
--- a/test/test_nodes.rb
+++ b/test/test_nodes.rb
@@ -28,6 +28,13 @@ class NodesCase < MiniTest::Test
     assert tree[:args].is_a? Vm::NumberExpression
     assert_equal 42 , tree[:args].value 
   end
+  def test_arg_list
+    @parser = @parser.args
+    tree = parse "(42, foo)"
+    assert_equal Array , tree.class
+    assert_equal 42 , tree.first.value 
+    assert_equal "foo" , tree.last.name 
+  end
 end