tx.go
func FromContext(ctx context.Context) (Tx, bool) {
	t, ok := ctx.Value(txKey).(Tx)
	return t, ok
}
func FromContext(ctx context.Context) (Tx, bool) {
	t, ok := ctx.Value(txKey).(Tx)
	return t, ok
}
func FromContext ( ctx context . Context ) ( Tx , bool ) { t , ok := ctx . Value ( txKey ) . ( Tx ) return t , ok }
// FromContext returns a newrelic.Tx from the context.
FromContext returns a newrelic . Tx from the context .