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all: update go directive to 1.18

Browse source 
Done with:

go get go@1.18
go mod tidy
go fix ./...

Using go1.21.3.

While here, simplify package syncmap by taking advantage of knowing
that all supported Go versions will have the go1.9 build constraint
satisfied.

For golang/go#60268.

Change-Id: Ic0f24ab13ada6839573e55beee5516c1a6c7f3cc
Reviewed-on: https://go-review.googlesource.com/c/sync/+/534220
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
This commit is contained in:
Dmitri Shuralyov 2023-10-10 19:30:18 -04:00 • committed by Gopher Robot
commit 10739b037d
8 changed files with 11 additions and 396 deletions
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10
syncmap/map.go
View file

@ -6,3 +6,13 @@
// This was the prototype for sync.Map which was added to the standard library's
// sync package in Go 1.9. https://golang.org/pkg/sync/#Map.
package syncmap
import "sync" // home to the standard library's sync.map implementation as of Go 1.9
// Map is a concurrent map with amortized-constant-time loads, stores, and deletes.
// It is safe for multiple goroutines to call a Map's methods concurrently.
//
// The zero Map is valid and empty.
//
// A Map must not be copied after first use.
type Map = sync.Map