time: document Tick will return nil if d <= 0

Fixes #14557.

Change-Id: I9610b79aafe9c15f9c998739b586fd0b41b90d70
Reviewed-on: https://go-review.googlesource.com/20031
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/time/tick.go b/src/time/tick.go
index 196e8ac61a6da384f6f12ace65f05a921e264ed1..ccc2d9b4791c1dcc245b16599cb01aa648e8b302 100644 (file)
--- a/src/time/tick.go
+++ b/src/time/tick.go
@@ -50,6 +50,7 @@ func (t *Ticker) Stop() {
 // channel only. While Tick is useful for clients that have no need to shut down
 // the Ticker, be aware that without a way to shut it down the underlying
 // Ticker cannot be recovered by the garbage collector; it "leaks".
+// Unlike NewTicker, Tick will return nil if d <= 0.
 func Tick(d Duration) <-chan Time {
        if d <= 0 {
                return nil