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-rw-r--r--spec/ruby/core/array/union_spec.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/spec/ruby/core/array/union_spec.rb b/spec/ruby/core/array/union_spec.rb
index ba2cc0d6b7..110894e83d 100644
--- a/spec/ruby/core/array/union_spec.rb
+++ b/spec/ruby/core/array/union_spec.rb
@@ -15,7 +15,7 @@ describe "Array#union" do
end
it "does not return subclass instances for Array subclasses" do
- ArraySpecs::MyArray[1, 2, 3].union.should be_an_instance_of(Array)
+ ArraySpecs::MyArray[1, 2, 3].union.should.instance_of?(Array)
end
it "accepts multiple arguments" do