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Add or nil to call-seq of Enumerator::ArithmeticSequence#begin

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```
% ruby -ve 'p (nil..).first'
ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-darwin18]
nil
% ruby -ve 'p (nil..).begin'
ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-darwin18]
nil
```
This commit is contained in:
Kazuhiro NISHIYAMA 2019-04-27 12:21:35 +09:00
parent be8cf0d4f6
commit 48313f129a
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enumerator.c
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@ -2936,7 +2936,7 @@ rb_arith_seq_new(VALUE obj, VALUE meth, int argc, VALUE const *argv,
}
/*
* call-seq: aseq.begin -> num
* call-seq: aseq.begin -> num or nil
*
* Returns the number that defines the first element of this arithmetic
* sequence.