[dev.fuzz] all: merge master into dev.fuzz

Change-Id: I5d8c8329ccc9d747bd81ade6b1cb7cb8ae2e94b2

1 files changed, 3 insertions, 1 deletions

diff --git a/src/sync/once.go b/src/sync/once.go
index ca04408224..8844314e7e 100644
--- a/src/sync/once.go
+++ b/src/sync/once.go
@@ -9,11 +9,13 @@ import (
 )
 
 // Once is an object that will perform exactly one action.
+//
+// A Once must not be copied after first use.
 type Once struct {
 	// done indicates whether the action has been performed.
 	// It is first in the struct because it is used in the hot path.
 	// The hot path is inlined at every call site.
-	// Placing done first allows more compact instructions on some architectures (amd64/x86),
+	// Placing done first allows more compact instructions on some architectures (amd64/386),
 	// and fewer instructions (to calculate offset) on other architectures.
 	done uint32
 	m    Mutex