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15 lines
552 B
15 lines
552 B
8 years ago
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diff --git a/activesupport/lib/active_support/core_ext/object/duplicable.rb b/activesupport/lib/active_support/core_ext/object/duplicable.rb
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index d4bf8ce..58045d5 100644
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--- a/activesupport/lib/active_support/core_ext/object/duplicable.rb
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+++ b/activesupport/lib/active_support/core_ext/object/duplicable.rb
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@@ -73,7 +73,8 @@ def duplicable?
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class Symbol
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begin
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- :symbol.dup
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+ :symbol.dup # Ruby 2.4.x.
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+ 'symbol_from_string'.to_sym.dup # Some symbols can't `dup` in Ruby 2.4.0.
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rescue TypeError
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# Symbols are not duplicable:
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