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-rw-r--r--spec/ruby/core/string/fixtures/classes.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/spec/ruby/core/string/fixtures/classes.rb b/spec/ruby/core/string/fixtures/classes.rb
index 6af106f9d3..1cc7600abb 100644
--- a/spec/ruby/core/string/fixtures/classes.rb
+++ b/spec/ruby/core/string/fixtures/classes.rb
@@ -4,7 +4,7 @@ class Object
def unpack_format(count=nil, repeat=nil)
format = "#{instance_variable_get(:@method)}#{count}"
format *= repeat if repeat
- format
+ format.dup # because it may then become tainted
end
end