Issue #5781 has been updated by Eregon (Benoit Daloze).


FWIW, a long time ago I tried to implement https://bugs.ruby-lang.org/issues/5781#note-7 in MRI but it turned out to be not so easy and I gave up.

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Feature #5781: Query attributes (attribute methods ending in `?` mark)
https://bugs.ruby-lang.org/issues/5781#change-79376

* Author: trans (Thomas Sawyer)
* Status: Assigned
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Target version: 
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Pretty sure this has come up before, but I'd like to revisit b/c I don't understand why it isn't allowed.

Sometimes I define "query" attributes, and in those cases I'd like the reader method to end in a `?` mark. Currently I have to do:

    # @attribute
    def foo?
      @foo
    end

or, if I don't mind a shadowing bare method,

    attr :foo
    alias_method :foo?, :foo

So why not just allow:

    attr :foo?

Currently this causes an error. But why? It just seems like a waste of potentially cleaner code.



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