[ruby-core:98064] [CommonRuby Feature#16817] attr_predicate or attr_query or attr_something for ? methods

Issue #16817 has been reported by robotdana (Dana Sherson).

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Feature #16817: attr_predicate or attr_query or attr_something for ? methods
https://bugs.ruby-lang.org/issues/16817

* Author: robotdana (Dana Sherson)
* Status: Open
* Priority: Normal
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I would like `attr_predicate` like attr_reader etc.

`attr_predicate :cat` would define a method named `:cat?` that returned the value for ivar `@cat`.

I would like this because i find myself writing this:
```
def cat?
  @cat
end
```
which is fine once, but becomes tedious with many attributes

Another possibility is allowing `attr_reader :cat?` to define a method that returns the value for ivar `@cat`. currently it raises `NameError (invalid attribute name `cat?')`

Thank you



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