Remove ANONYMOUS_CLASS guard

Not a practical example. Hard to imagine real life use case for passing
anonymous class.

Co-authored-by: Paweł Pacana <pawel.pacana@gmail.com>

Author: 2 people

aggregate_root/lib/aggregate_root.rb

@@ -9,12 +9,9 @@
 
 module AggregateRoot
   module OnDSL
-    ANONYMOUS_CLASS = "#<Class:".freeze
-
     def on(*event_klasses, &block)
       event_klasses.each do |event_klass|
         name = event_klass.to_s
-        raise(ArgumentError, "Anonymous class is missing name") if name.start_with? ANONYMOUS_CLASS
 
         handler_name = "on_#{name}"
         define_method(handler_name, &block)

aggregate_root/spec/aggregate_root_spec.rb

@@ -256,16 +256,6 @@ def custom_expired(_event)
       order.apply(Orders::Events::OrderExpired.new)
       expect(order.status).to eq(%i[base_expired inherited_expired])
     end
-
-    it "does not support anonymous events" do
-      expect do
-        Class.new do
-          include AggregateRoot
-
-          on(Class.new) { |_ev| }
-        end
-      end.to raise_error(ArgumentError, "Anonymous class is missing name")
-    end
   end
 
   describe "#initialize" do

ruby_event_store/lib/ruby_event_store/projection.rb

@@ -4,8 +4,6 @@ module RubyEventStore
   class Projection
     private_class_method :new
 
-    ANONYMOUS_CLASS = "#<Class:".freeze
-
     def initialize(initial_state = nil)
       @handlers = {}
       @init = -> { initial_state }
@@ -20,7 +18,6 @@ def on(*event_klasses, &block)
 
       event_klasses.each do |event_klass|
         name = event_klass.to_s
-        raise(ArgumentError, 'Anonymous class is missing name') if name.start_with? ANONYMOUS_CLASS
 
         @handlers[name] = ->(state, event) { block.call(state, event) }
       end