var expvar.varKeys

5 uses

	expvar (current package)
		expvar.go#L270: 	varKeys   []string // sorted
		expvar.go#L282: 	varKeys = append(varKeys, name)
		expvar.go#L283: 	sort.Strings(varKeys)
		expvar.go#L326: 	for _, k := range varKeys {

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