const golang.org/x/sys/unix.ENOPROTOOPT

one use

	golang.org/x/sys/unix (current package)
		zerrors_darwin_arm64.go#L1549: 	ENOPROTOOPT     = syscall.Errno(0x2a)

The pages are generated with Golds v0.2.8-preview. (GOOS=darwin GOARCH=arm64)