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Merge from origin/emacs-27

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4b9fbdb5a7 ; Update TODO item about ligature support
03d44acfdd * doc/lispref/control.texi (Processing of Errors): Improve...
b48ab743a8 Minor fixups for mutability doc
6ac2326e5b Don’t use “constant” for values you shouldn’t change
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Glenn Morris 2020-05-23 07:50:29 -07:00
commit fabcc1ee13
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doc/lispintro/emacs-lisp-intro.texi
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@ -7317,8 +7317,6 @@ which leave the original list as it was. One way to find out how this
works is to experiment. We will start with the @code{setcar} function.
@need 1200
@cindex constant lists
@cindex mutable lists
First, we can make a list and then set the value of a variable to the
list, using the @code{setq} special form. Because we intend to use
@code{setcar} to change the list, this @code{setq} should not use the
@ -7327,8 +7325,7 @@ a list that is part of the program and bad things could happen if we
tried to change part of the program while running it. Generally
speaking an Emacs Lisp program's components should be constant (or
unchanged) while the program is running. So we instead construct an
animal list that is @dfn{mutable} (or changeable) by using the
@code{list} function, as follows:
animal list by using the @code{list} function, as follows:
@smallexample
(setq animals (list 'antelope 'giraffe 'lion 'tiger))