Issue #17004 has been updated by duerst (Martin D=FCrst).


Additional questions:
- Are there any other languages that have such a feature?
- Where there are performance implications, couldn't that be solved by an
  additional parameter to the methods in question? Or by a better design
  of interfaces (e.g. different methods for cases where an expensive
  return value isn't needed)? (@jeremyevans0)

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Feature #17004: Provide a way for methods to omit their return value
https://bugs.ruby-lang.org/issues/17004#change-86396

* Author: shyouhei (Shyouhei Urabe)
* Status: Open
* Priority: Normal
----------------------------------------
In ruby, it often is the case for a method's return value to not be used by=
 its caller.  Even when a method returns something meaningful, its caller i=
s free to ignore it.

Why not provide a way for a method to know if its return value is needed or=
 not?  That adds a room for methods to be optimized, by for instance skippi=
ng creation of complex return values.

The following pull request implements `RubyVM.return_value_is_used?` method=
, which does that: https://github.com/ruby/ruby/pull/3271



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