mirah .diff

diff --git a/lib/mirah/ast.rb b/lib/mirah/ast.rb
index 80cac7f..3993669 100644
--- a/lib/mirah/ast.rb
+++ b/lib/mirah/ast.rb
@@ -104,6 +104,7 @@ module Duby
       def inspect_children(indent = 0)
         indent_str = ' ' * indent
         str = ''
+if children
         children.each_with_index do |child, i|
           extra_indent = 0
           if child
@@ -129,6 +130,9 @@ module Duby
             end
           end
         end
+else
+  str << "\n(children is nil)"
+end
         str
       end
 
diff --git a/lib/mirah/transform.rb b/lib/mirah/transform.rb
index aa9d077..c289579 100644
--- a/lib/mirah/transform.rb
+++ b/lib/mirah/transform.rb
@@ -803,7 +803,7 @@ module Duby
               LocalAssignment.new(block, first_node.position, temp) do |l|
                 [transformer.transform(first_node, l)]
               end,
-              If.new(parent, position) do |iff|
+              If.new(block, block.position) do |iff|
                 [
                   Condition.new(iff, first_node.position) do |cond|
                     [Local.new(cond, first_node.position, temp)]