Is it possible to remove unless keyword?

[asterite]

The unless keyword will never be removed, no matter what.

[j8r]

It is still inferior than if, because we can’t do:

unless X
  ...
else unless Y
  ...
else
  ...
end

Also, unless could be a macro, which expands to if !({{expr}}).

[asterite]

Nope, macros require a do.