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require "-test-/string/string"
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class Test_StrEncAssociate < Test::Unit::TestCase
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s = Bug::String.new("abc")
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s.force_encoding(Encoding::US_ASCII)
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assert_raise(RuntimeError) {s.associate_encoding!(Encoding::US_ASCII)}
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assert_raise(RuntimeError) {s.associate_encoding!(Encoding::UTF_8)}