Doesn't work on macOS with emacs-plus 26.0.91

[bwolf]

Recently I started using the development version of Emacs to get the vfork patch. Unfortunately esup stopped working for me with GNU Emacs 26.0.91 on macOS 10.13.4. Emacs is installed via brew install emacs-plus --devel.

When running esup I get:

Debugger entered--Lisp error: (wrong-type-argument (or eieio-object class) nil obj)
  signal(wrong-type-argument ((or eieio-object class) nil obj))
  eieio-oref(nil :expression-string)
  esup-fontify-results((#<esup-result esup-result> ... #<esup-result esup-result> nil))
  esup-display-results()
  esup-child-process-sentinel(#<process *esup-child*> "finished\n")

Please note that I truncated the output of esup-fontify-results (( )), indicated by ....

[Yevgnen]

Same but I'm using emacs-mac.