pass message to compile, not frame

lib/ast/if_expression.rb

@@ -1,15 +1,15 @@
 module Ast
   class IfExpression < Expression
 #    attr_reader  :cond, :if_true, :if_false
-    def compile method , frame
-      is = cond.compile(method,frame)
+    def compile method , message
+      is = cond.compile(method,message)
       #      is.is_false(frame,method)
       # TODO should/will use different branches for different conditions. 
       branch = Virtual::ImplicitBranch.new "if_merge"
       method.add branch
       last = is
       if_true.each do |part|
-        last = part.compile(method,frame )
+        last = part.compile(method,message )
         raise part.inspect if last.nil?
       end
       merge = Virtual::Label.new(branch.name)
@@ -17,7 +17,7 @@ module Ast
       branch.swap
       method.current = branch
       if_false.each do |part|
-        last = part.compile(method,frame )
+        last = part.compile(method,message )
         raise part.inspect if last.nil?
       end
       method.add merge