Show something for anonymous classes. [Fixes #366]

lib/pry/wrapped_module.rb

@@ -20,12 +20,23 @@ class Pry
     def method_prefix
       if singleton_class?
         if Module === singleton_instance
-          "#{singleton_instance.name}."
+          "#{WrappedModule.new(singleton_instance).nonblank_name}."
         else
           "self."
         end
       else
-        "#{name}#"
+        "#{nonblank_name}#"
+      end
+    end
+
+    # The name of the Module if it has one, otherwise #<Class:0xf00>.
+    #
+    # @return [String]
+    def nonblank_name
+      if name.to_s == ""
+        wrapped.inspect
+      else
+        name
       end
     end
 

test/test_wrapped_module.rb

@@ -33,6 +33,14 @@ describe Pry::WrappedModule do
     describe "of singleton classes of objects" do
       Pry::WrappedModule.new(class << @foo; self; end).method_prefix.should == "self."
     end
+
+    describe "of anonymous classes should not be empty" do
+      Pry::WrappedModule.new(Class.new).method_prefix.should =~ /#<Class:.*>#/
+    end
+
+    describe "of singleton classes of anonymous classes should not be empty" do
+      Pry::WrappedModule.new(class << Class.new; self; end).method_prefix.should =~ /#<Class:.*>./
+    end
   end
 
   describe ".singleton_class?" do