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-rw-r--r--mrbgems/mruby-string-ext/mrblib/string.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/mrbgems/mruby-string-ext/mrblib/string.rb b/mrbgems/mruby-string-ext/mrblib/string.rb
index 2a323c858..311803ea2 100644
--- a/mrbgems/mruby-string-ext/mrblib/string.rb
+++ b/mrbgems/mruby-string-ext/mrblib/string.rb
@@ -93,7 +93,7 @@ class String
# "hello".rstrip! #=> nil
#
def rstrip!
- raise RuntimeError, "can't modify frozen String" if frozen?
+ raise FrozenError, "can't modify frozen String" if frozen?
s = self.rstrip
(s == self) ? nil : self.replace(s)
end