[ruby-core:109243] [Ruby master Bug#18909] ARGF.readlines reads more than current file

Issue #18909 has been updated by mame (Yusuke Endoh).


Is this what you want?

```
$ echo primo > a
$ echo secundo >> a
$ echo PRIMO > b

$ ruby -i.bak -e 'until ARGF.closed?; x = ARGF.file.readlines; puts "#{ x.size } lines"; puts x; ARGF.skip; end' a b

$ cat a
2 lines
primo
secundo

$ cat b
1 lines
PRIMO
```

TBH I don't recommend to use `-i` either

----------------------------------------
Bug #18909: ARGF.readlines reads more than current file
https://bugs.ruby-lang.org/issues/18909#change-98377

* Author: JohanJosefsson (Johan Josefsson)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 2.3.1p112 (2016-04-26) [x86_64-linux-gnu]
* Backport: 2.7: REQUIRED, 3.0: REQUIRED, 3.1: REQUIRED
----------------------------------------
The docuentation says that ARGF.readlines: *Reads ARGF's current file in its entirety* , but this is what happens:

`$ cat fileA
A
$ cat fileB
B
$ ruby -e 'puts ARGF.readlines' fileA fileB
A
B`
i.e. it reads both the current file and the next one (all files?).



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