$ go run main.go
# github.com/astaxie/beego/utils
F:\GitHub\gopro\src\github.com\astaxie\beego\utils\mail.go:407: undefined: sync.Pool
# github.com/astaxie/beego/logs
F:\GitHub\gopro\src\github.com\astaxie\beego\logs\log.go:138: undefined: sync.Pool
F:\GitHub\gopro\src\github.com\astaxie\beego\logs\log.go:168: undefined: sync.Pool
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