kazu	2019-01-20 13:44:25 +0900 (Sun, 20 Jan 2019)

  New Revision: 66875

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66875

  Log:
    raise FrozenError instead of RuntimeError

  Modified files:
    trunk/lib/set.rb
Index: lib/set.rb
===================================================================
--- lib/set.rb	(revision 66874)
+++ lib/set.rb	(revision 66875)
@@ -527,7 +527,7 @@ class Set https://github.com/ruby/ruby/blob/trunk/lib/set.rb#L527
     if @hash.respond_to?(:rehash)
       @hash.rehash # This should perform frozenness check.
     else
-      raise "can't modify frozen #{self.class.name}" if frozen?
+      raise FrozenError, "can't modify frozen #{self.class.name}" if frozen?
     end
     self
   end

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