stgit.el: Emacs backwards compatibility #560
Description
defvar-local is a Lisp macro in ‘subr.el’.
(defvar-local VAR VAL &optional DOCSTRING)
Define VAR as a buffer-local variable with default value VAL.
Like ‘defvar’ but additionally marks the variable as being automatically
buffer-local wherever it is set.
Probably introduced at or before Emacs version 24.3.
defvar-local needs at least two arguments. However, only one argument is provided.
related: #552