tree 607baf0c1af5ac1a32670a53419ab85df655625c
parent c6118af55864916c2c3b1bca8e216e627f232bf3
author Rob Pike <r@golang.org> 1537158306 +1000
committer Rob Pike <r@golang.org> 1537307531 +0000

builtin: document when len and cap are constant

The rules are subtle, but under some circumstances the result
can be constant. Mention this and refer to the appropriate
section of the specification.

Fixes #27588.

Change-Id: I4beaad036db87501378fb2ef48d216742d096933
Reviewed-on: https://go-review.googlesource.com/135519
Reviewed-by: Robert Griesemer <gri@golang.org>