Issue #17099 has been reported by S_H_ (Shun Hiraoka).

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Feature #17099: Remove Module#attr warning with given boolean argument
https://bugs.ruby-lang.org/issues/17099

* Author: S_H_ (Shun Hiraoka)
* Status: Open
* Priority: Normal
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`Module#attr` works as `Module#attr_reader` by default(since in `1.9.1`).
And, optional boolean argument is obsoleted(But, it works as `Module#attr_writer` given optional argument `true`).

I think it's okey to remove `Module#attr` warning (with given optional boolean argument).





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