update to use new ast

soml was updated to have a typed ast layer to make programatic creation
easier
this brings LOTS of syntax change with it, that does not really mean
anything at all
All tests pass again so back to the same

lib/register/instruction.rb

@@ -19,7 +19,7 @@ module Register
       @source = source
       @next = nekst
       return unless source
-      raise "Source must be string or ast node, not #{source.class}" unless source.is_a?(String) or source.is_a?(AST::Node)
+      raise "Source must be string or ast node, not #{source.class}" unless source.is_a?(String) or source.is_a?(Soml::Code)
     end
     attr_reader :source