Debugger entered--Lisp error: (void-variable tex--prettify-symbols-alist)
  (set (make-local-variable (quote prettify-symbols-alist)) tex--prettify-symbols-alist)
  eval((set (make-local-variable (quote prettify-symbols-alist)) tex--prettify-symbols-alist) nil)
  elisp--eval-last-sexp(nil)
  eval-last-sexp(nil)
  funcall-interactively(eval-last-sexp nil)
  call-interactively(eval-last-sexp nil nil)
  command-execute(eval-last-sexp)