Fixed Module#to_s and #name for #const_set modules

mrbgems/mruby-class-ext/test/module.rb

 assert 'Module#name' do
-  module A
-    class B
+  module Outer
+    class Inner; end
+    const_set :SetInner, Class.new
   end
+
+  assert_equal 'Outer', Outer.name
+  assert_equal 'Outer::Inner', Outer::Inner.name
+  assert_equal 'Outer::SetInner', Outer::SetInner.name
+
+  outer = Module.new do
+    const_set :SetInner, Class.new
   end
+  Object.const_set :SetOuter, outer
+
+  assert_equal 'SetOuter', SetOuter.name
+  assert_equal 'SetOuter::SetInner', SetOuter::SetInner.name
+
+  mod = Module.new
+  cls = Class.new
 
-  assert_nil A::B.singleton_class.name
-  assert_equal 'Fixnum', Fixnum.name
-  assert_equal 'A::B', A::B.name
+  assert_nil mod.name
+  assert_nil cls.name
 end

src/class.c

@@ -2178,6 +2178,9 @@ mrb_mod_const_set(mrb_state *mrb, mrb_value mod)
 
   mrb_get_args(mrb, "no", &id, &value);
   check_const_name_sym(mrb, id);
+  if (mrb_type(value) == MRB_TT_CLASS || mrb_type(value) == MRB_TT_MODULE) {
+    setup_class(mrb, mrb_class_ptr(mod), mrb_class_ptr(value), id);
+  }
   mrb_const_set(mrb, mod, id, value);
   return value;
 }

test/t/module.rb

@@ -787,10 +787,28 @@ end
 # @!endgroup prepend
 
 assert('Module#to_s') do
-  module Test4to_sModules
+  module Outer
+    class Inner; end
+    const_set :SetInner, Class.new
+  end
+
+  assert_equal 'Outer', Outer.to_s
+  assert_equal 'Outer::Inner', Outer::Inner.to_s
+  assert_equal 'Outer::SetInner', Outer::SetInner.to_s
+
+  outer = Module.new do
+    const_set :SetInner, Class.new
   end
+  Object.const_set :SetOuter, outer
+
+  assert_equal 'SetOuter', SetOuter.to_s
+  assert_equal 'SetOuter::SetInner', SetOuter::SetInner.to_s
+
+  mod = Module.new
+  cls = Class.new
 
-  assert_equal 'Test4to_sModules', Test4to_sModules.to_s
+  assert_equal "#<Module:0x", mod.to_s[0,11]
+  assert_equal "#<Class:0x", cls.to_s[0,10]
 end
 
 assert('Module#inspect') do