lib/ostruct.rb: Use `FrozenError` instead of `RuntimeError`.

Patch by Yuuji Yaginuma. [Fixes GH-1808]

In other classes, `FrozenError` will be raised if change the frozen
object.
In order to match the behavior, I think that `FrozenError` should
use in `OpenStruct`.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62271 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/ostruct.rb b/lib/ostruct.rb
index 28890304e4..f2380144f3 100644
--- a/lib/ostruct.rb
+++ b/lib/ostruct.rb
@@ -156,7 +156,7 @@ class OpenStruct
     begin
       @modifiable = true
     rescue
-      raise RuntimeError, "can't modify frozen #{self.class}", caller(3)
+      raise FrozenError, "can't modify frozen #{self.class}", caller(3)
     end
     @table
   end