Variable: tab-stop-list
tab-stop-list is a customizable variable defined in indent.el.gz.
Value
nil
Documentation
List of tab stop positions used by tab-to-tab-stop.
This should be nil, or a list of integers, ordered from smallest to largest.
It implicitly extends to infinity through repetition of the last step.
For example, (1 2 5) is equivalent to (1 2 5 8 11 ...). If the list has
fewer than 2 elements, tab-width is used as the "last step".
A value of nil means a tab stop every tab-width columns.
This variable was added, or its default value changed, in Emacs 24.4.
Probably introduced at or before Emacs version 22.1.
Source Code
;; Defined in /usr/src/emacs/lisp/indent.el.gz
(defcustom tab-stop-list nil
"List of tab stop positions used by `tab-to-tab-stop'.
This should be nil, or a list of integers, ordered from smallest to largest.
It implicitly extends to infinity through repetition of the last step.
For example, (1 2 5) is equivalent to (1 2 5 8 11 ...). If the list has
fewer than 2 elements, `tab-width' is used as the \"last step\".
A value of nil means a tab stop every `tab-width' columns."
:group 'indent
:version "24.4" ; from explicit list to nil
:safe 'listp
:type '(repeat integer))