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spec: more precise prose for special case of append

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As written, the special case for append may be interpreted
such that any first argument that is assignable to []byte
is permissible, including nil. This change makes makes it
clear that a slice argument is required.

Not a language change. The compiler always expected a slice
argument.

Fixes #76226.

Change-Id: I73a1725d10096690335d6edf5793beb5de73578f
Reviewed-on: https://go-review.googlesource.com/c/go/+/718880
Reviewed-by: Junyang Shao <shaojunyang@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Robert Griesemer 2025-11-07 19:52:27 -08:00 • committed by Gopher Robot
parent cdf64106f6
commit 5241d114f5
1 changed files with 3 additions and 3 deletions
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6
doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{
"Title": "The Go Programming Language Specification",
"Subtitle": "Language version go1.26 (Oct 1, 2025)",
"Subtitle": "Language version go1.26 (Nov 9, 2025)",
"Path": "/ref/spec"
}-->
@ -7383,8 +7383,8 @@ The values <code>x</code> are passed to a parameter of type <code>...E</code>
where <code>E</code> is the element type of <code>S</code>
and the respective <a href="#Passing_arguments_to_..._parameters">parameter
passing rules</a> apply.
As a special case, <code>append</code> also accepts a first argument assignable
to type <code>[]byte</code> with a second argument of string type followed by
As a special case, <code>append</code> also accepts a slice whose type is assignable to
type <code>[]byte</code> with a second argument of <code>string</code> type followed by
<code>...</code>.
This form appends the bytes of the string.
</p>