switch-to-buffer broken when its argument is nil

[ilupin]

In the document string of switch-to-buffer:

If BUFFER-OR-NAME is nil, switch to the buffer returned by `other-buffer'.

However, it fails when purpose mode is turned on.

[bmag]

Thanks for the report, I will look into it. Can you describe how it fails?

[ilupin]

(eval (switch-to-buffer nil)) just produces an error "Wrong type argument: stringp, nil".
Normally it should switch to previous buffer.

[bmag]

I've found the problem and I'll push a fix later today or tomorrow. In the meantime you can use this advice:

(advice-add 'purpose-select-buffer :filter-args
            (lambda (args)
              (cons (window-normalize-buffer-to-switch-to (car args))
                    (cdr args))))

[bmag]

Fixed in 3820ff8