pkg crypto/ed25519, type Options struct, Context string #31804
pkg crypto/ed25519, type Options struct, Hash crypto.Hash #31804
pkg crypto/rsa, type OAEPOptions struct, MGFHash crypto.Hash #19974
pkg crypto/subtle, func XORBytes([]uint8, []uint8, []uint8) int #53021
pkg crypto/tls, method (*CertificateVerificationError) Error() string #48152
pkg crypto/tls, method (*CertificateVerificationError) Unwrap() error #48152

be observed by <code>main</code>, since there are no synchronization
events between the two threads.  The loop in <code>main</code> is not
guaranteed to finish.
</p>

<p>
There are subtler variants on this theme, such as this program.
</p>

<pre>
type T struct {
	msg string
}

var g *T

func setup() {
	t := new(T)
	t.msg = "hello, world"
	g = t
}