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

one use

	golang.org/x/sys/unix (current package)
		ztypes_linux.go#L3040: 	BPF_CORE_FIELD_EXISTS                      = 0x2

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)