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Bug #11953

Updated by nobu (Nobuyoshi Nakada) 10 months ago

This is my first bug reporting, so I'm sorry if this isn't exactly correct format. I'll update my report accordingly if pointed in the right direction.

I ran into what appears to be a bug while doing a quiz.

I've included the breaking code, the test suite and the description of the quiz as attachments to this bug report.

The following code works fine on Ruby 2.2.4.

```ruby
class Prime
def self.nth(num)
error(num)
primes = build_primes(num)
primes.last
end

private

def build_primes(num)
primes = [2]
index = 3
until primes.size == num
if example?(index, primes)
primes << index
end
index += 1
end
primes
end

def error(num)
unless num > 0
raise ArgumentError
end
end

def example?(index, primes)
primes.each do |prime|
if index % prime == 0
return false
end
end
true
end
end
```


It raises this error in Ruby 2.3.0

```
ThreadError: deadlock; recursive locking
/home/clayton/.rubies/ruby-2.3.0/lib/ruby/2.3.0/singleton.rb:140:in `synchronize'
/home/clayton/.rubies/ruby-2.3.0/lib/ruby/2.3.0/singleton.rb:140:in `instance'
/home/clayton/.rubies/ruby-2.3.0/lib/ruby/2.3.0/singleton.rb:142:in `block in instance'
/home/clayton/.rubies/ruby-2.3.0/lib/ruby/2.3.0/singleton.rb:140:in `synchronize'
/home/clayton/.rubies/ruby-2.3.0/lib/ruby/2.3.0/singleton.rb:140:in `instance'
/home/clayton/exercism/ruby/nth-prime/nth_prime.rb:3:in `nth'
nth_prime_test.rb:28:in `test_first'
```


If this is expected behavior, I'm sorry in advance for wasting your time.

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