Ruby

I think it should use FrozenError instead of RuntimeError.
I can't reproduce without modifying instance variable directly.

% ruby -v -r set -e 'Set[].tap{|s|s.instance_variable_set(:@hash, :dummy)}.freeze.reset' ruby 2.6.0dev (2018-01-06 trunk 61640) [x86_64-darwin16] Traceback (most recent call last):	1: from -e:1:in `<main>' .../lib/ruby/2.6.0/set.rb:527:in `reset': can't modify frozen Set (RuntimeError) % ruby -v -I ./lib -r set -e 'Set[].tap{|s|s.instance_variable_set(:@hash, :dummy)}.freeze.reset' ruby 2.6.0dev (2018-01-06 trunk 61640) [x86_64-darwin16] Traceback (most recent call last):	1: from -e:1:in `<main>' .../lib/set.rb:527:in `reset': can't modify frozen Set (FrozenError) 

diff --git a/lib/set.rb b/lib/set.rb index 9642e74af4..d777b81b8f 100644 --- a/lib/set.rb +++ b/lib/set.rb @@ -524,7 +524,7 @@ def reset if @hash.respond_to?(:rehash) @hash.rehash # This should perform frozenness check. else - raise "can't modify frozen #{self.class.name}" if frozen? + raise FrozenError, "can't modify frozen #{self.class.name}" if frozen?  end self end