Dummy support of alias_global_variable_node

lib/typeprof/core/ast.rb

@@ -215,6 +215,7 @@ def self.create_node(raw_node, lenv, use_result = true)
       when :defined_node then DefinedNode.new(raw_node, lenv)
       when :splat_node then SplatNode.new(raw_node, lenv)
       when :for_node then ForNode.new(raw_node, lenv)
+      when :alias_global_variable_node then AliasGlobalVariableNode.new(raw_node, lenv)
 
       # call
       when :super_node then SuperNode.new(raw_node, lenv)

lib/typeprof/core/ast/variable.rb

@@ -202,6 +202,17 @@ def retrieve_at(pos, &blk)
       end
     end
 
+    class AliasGlobalVariableNode < Node
+      def initialize(raw_node, lenv)
+        super(raw_node, lenv)
+        # XXX: Who use this? I want to hard-code English.rb
+      end
+
+      def install0(genv)
+        Source.new(genv.nil_type)
+      end
+    end
+
     class ClassVariableWriteNode < Node
       def initialize(raw_node, rhs, lenv)
         super(raw_node, lenv)