Issue #14416 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: REQUIRED to 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: DONE

ruby_2_5 r64443 merged revision(s) 62099.

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Bug #14416: Net::POPMail methods modify frozen literal when using default arg
https://bugs.ruby-lang.org/issues/14416#change-73595

* Author: Mzim (Michael Zimmerman)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin17]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: DONE
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Net::POPMail #pop, #top, and #header can modify their "dest" argument. Problem is it has a default value of '', and so FrozenError can be thrown.

Problem methods start here:
https://github.com/ruby/ruby/blob/582951e2c8995d6bab5ddaf98cd3816310f8d506/lib/net/pop.rb#L802



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