Where should I add the magic comment of lexical-binding?

Question

The first line of a .el file used to be

;;; foo.el - a foo package

Does it works if the magic comment is added after this?

;;; foo.el - a foo package
;;; -*- lexical-binding: t -*-

Or even later in the file?

score 2 · Answer 1 · answered Mar 29 '16 at 13:23

2

The recommended way is

;;; <FILE> --- <DESCRIPTION>  -*- lexical-binding:t -*-

answered Mar 29 '16 at 13:23

Stefan

phils · Accepted Answer · 2016-03-29T08:48:24.647

1

This must be in the first line. An exception is made for shell scripts (only), where it may alternatively be on the second line.

Note that, unlike other file-local vars, lexical-binding can only appear in this first-line listing.

edited Mar 29 '16 at 08:48

answered Mar 29 '16 at 08:42

phils

Could I do like this `;;; foo.el - a foo package -*- lexical-binding: t -*-` on the first line? – tom Mar 29 '16 at 09:04
Yes you can. Note that if you use `M-x add-file-local-variable-prop-line` it will do exactly that. – phils Mar 29 '16 at 09:39

2 Answers2