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[Emacs-diffs] emacs-26 decdfed: Clarify wording about functions' argumen
From: |
Eli Zaretskii |
Subject: |
[Emacs-diffs] emacs-26 decdfed: Clarify wording about functions' argument lists |
Date: |
Sat, 23 Jun 2018 03:39:41 -0400 (EDT) |
branch: emacs-26
commit decdfedf029904c3ecaa082e59e2501572ec77c9
Author: Eli Zaretskii <address@hidden>
Commit: Eli Zaretskii <address@hidden>
Clarify wording about functions' argument lists
* doc/lispref/functions.texi (Argument List): Clarify the
wording. (Bug#31872)
---
doc/lispref/functions.texi | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/doc/lispref/functions.texi b/doc/lispref/functions.texi
index 86181f1..93059e8 100644
--- a/doc/lispref/functions.texi
+++ b/doc/lispref/functions.texi
@@ -412,10 +412,14 @@ variables that tell you whether an argument was
explicitly passed.
binds @code{a} and @code{b} to the first two actual arguments, which are
required. If one or two more arguments are provided, @code{c} and
@code{d} are bound to them respectively; any arguments after the first
-four are collected into a list and @code{e} is bound to that list. If
-there are only two arguments, @code{c} is @code{nil}; if two or three
-arguments, @code{d} is @code{nil}; if four arguments or fewer, @code{e}
-is @code{nil}.
+four are collected into a list and @code{e} is bound to that list.
+Thus, if there are only two arguments, @code{c}, @code{d} and @code{e}
+are @code{nil}; if two or three arguments, @code{d} and @code{e} are
address@hidden; if four arguments or fewer, @code{e} is @code{nil}. Note
+that exactly five arguments with an explicit @code{nil} argument
+provided for @code{e} will cause that @code{nil} argument to be passed
+as a list with one element, @code{(nil)}, as with any other single
+value for @code{e}.
There is no way to have required arguments following optional
ones---it would not make sense. To see why this must be so, suppose
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