Allow DelegateClass() to module_eval given block

Methods that return classes often module_eval the given block
(e.g. Class.new and Struct.new).  This allows DelegateClass to
work similarly.  This makes it easier to use DelegateClass
directly without subclassing, so as not to create an unnecessary
subclass.

Implements [Feature #15842]

1 files changed, 5 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index 89ed64ce4b..9aa94cd4e9 100644
--- a/NEWS
+++ b/NEWS
@@ -118,6 +118,11 @@ Date::
     new Japanese era as an informal extension, until the new JIS X 0301 is
     issued.  [Feature #15742]
 
+Delegate::
+
+  * Object#DelegateClass accepts a block and module_evals it in the context
+    of the returned class, similar to Class.new and Struct.new.
+
 ERB::
 
   * Prohibit marshaling ERB instance.