shugo	2017-12-03 17:35:44 +0900 (Sun, 03 Dec 2017)

  New Revision: 60992

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=60992

  Log:
    Specify refinement inheritance by Module#include.
    
    [ruby-core:79880] [Bug #13271]

  Modified files:
    trunk/doc/syntax/refinements.rdoc
Index: doc/syntax/refinements.rdoc
===================================================================
--- doc/syntax/refinements.rdoc	(revision 60991)
+++ doc/syntax/refinements.rdoc	(revision 60992)
@@ -256,6 +256,29 @@ method lookup. https://github.com/ruby/ruby/blob/trunk/doc/syntax/refinements.rdoc#L256
 
 This behavior may be changed in the future.
 
+== Refinement inheritance by Module#include
+
+When a module X is included into a module Y, Y inherits refinments from X.
+
+For exmaple, C inherits refinements from A and B in the following code:
+
+  module A
+    refine X do ... end
+    refine Y do ... end
+  end
+  module B
+    refine Z do ... end
+  end
+  module C
+    include A
+    include B
+  end
+
+  using C
+  # Refinements in A and B are activated here.
+
+Refinements in descendents have higher precedence than those of ancestors.
+
 == Further Reading
 
 See https://bugs.ruby-lang.org/projects/ruby-trunk/wiki/RefinementsSpec for the

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