forward_missing_to causes segment fault when target does not exist

[Ragmaanir]

class X
  forward_missing_to x
end

X.new.test # Program exited because of a segmentation fault (11)

[asterite]

This is not a bug, you get a stack overflow at runtime. Basically forward_missing_to just declares method_missing that forwards the call. So your code becomes:

class X
  macro method_missing(name, args, block)
    x.\{{name.id}}(\{{*args}}) \{{block}}
  end
end

When you invoke X.new.test, that generates:

class X
  def test
    x.test
  end
end

In that method x is a call, and we hit method_missing again, thus generating:

class X
  def x
    x.x
  end
end

and there's the stack overflow.

I guess this will be more evident once we can say "Segmentation fault" and show some of the stack trace instead of a mere segfault. I'll relate #271 to this.