devID = getenv("GOIOS_DEV_ID")

	// e.g. Z8B3JBXXXX.org.golang.sample, Z8B3JBXXXX prefix is available at
	// https://developer.apple.com/membercenter/index.action#accountSummary as Team ID.
	appID = getenv("GOIOS_APP_ID")

	// e.g. Z8B3JBXXXX, available at
	// https://developer.apple.com/membercenter/index.action#accountSummary as Team ID.
	teamID = getenv("GOIOS_TEAM_ID")

	// Device IDs as listed with ios-deploy -c.

These kinds of changes are unavoidable and
[permitted by the Go 1 compatibility rules](/doc/go1compat).
Even so, Go provides a mechanism called GODEBUG to
reduce the impact such changes have on Go developers
using newer toolchains to compile old code.

A GODEBUG setting is a `key=value` pair
that controls the execution of certain parts of a Go program.
The environment variable `GODEBUG`

      The latency impact of starting and stopping execution traces has been dramatically reduced.
      Execution traces may now begin or end during the garbage collection mark phase.
    </p>
    <p>
      To allow Go developers to take advantage of these improvements, an experimental
      trace reading package is available at <a href="/pkg/golang.org/x/exp/trace">golang.org/x/exp/trace</a>.