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-rw-r--r--spec/ruby/core/array/pack/shared/string.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/spec/ruby/core/array/pack/shared/string.rb b/spec/ruby/core/array/pack/shared/string.rb
index 8c82e8c617..2f70dc3951 100644
--- a/spec/ruby/core/array/pack/shared/string.rb
+++ b/spec/ruby/core/array/pack/shared/string.rb
@@ -40,7 +40,7 @@ describe :array_pack_string, shared: true do
f = pack_format("*")
[ [["\u{3042 3044 3046 3048}", 0x2000B].pack(f+"U"), Encoding::BINARY],
[["abcde\xd1", "\xFF\xFe\x81\x82"].pack(f+"u"), Encoding::BINARY],
- [["a".force_encoding("ascii"), "\xFF\xFe\x81\x82"].pack(f+"u"), Encoding::BINARY],
+ [["a".dup.force_encoding("ascii"), "\xFF\xFe\x81\x82"].pack(f+"u"), Encoding::BINARY],
# under discussion [ruby-dev:37294]
[["\u{3042 3044 3046 3048}", 1].pack(f+"N"), Encoding::BINARY]
].should be_computed_by(:encoding)