var golang.org/x/tools/go/packages.ioLimit

3 uses

	golang.org/x/tools/go/packages (current package)
		packages.go#L1319: 	ioLimit  = make(chan unit, 20)
		packages.go#L1349: 			ioLimit <- unit{} // acquire a token
		packages.go#L1351: 			<-ioLimit // release a token