for _, tt := range []struct {
		error
		ok bool
	}{
		{syscall.EADDRNOTAVAIL, true},
		{&os.SyscallError{Syscall: "syscall", Err: syscall.EADDRNOTAVAIL}, true},
		{&OpError{Op: "op", Err: syscall.EADDRNOTAVAIL}, true},
		{&OpError{Op: "op", Err: &os.SyscallError{Syscall: "syscall", Err: syscall.EADDRNOTAVAIL}}, true},

		{syscall.EINVAL, false},
		{&os.SyscallError{Syscall: "syscall", Err: syscall.EINVAL}, false},

package syscall

import "runtime"

// TODO: Auto-generate some day. (Hard-coded in binaries so not likely to change.)
const (
	E2BIG           Errno = 1
	EACCES          Errno = 2
	EADDRINUSE      Errno = 3
	EADDRNOTAVAIL   Errno = 4
	EAFNOSUPPORT    Errno = 5
	EAGAIN          Errno = 6
	EALREADY        Errno = 7
	EBADF           Errno = 8
	EBADMSG         Errno = 9
	EBUSY           Errno = 10
	ECANCELED       Errno = 11

	//
	// The opposite can also happen: if we ask the kernel to pick an appropriate
	// originating local address, sometimes it picks one that is already in use.
	// So if the error is EADDRNOTAVAIL, we have to try again too, just for
	// a different reason.
	//
	// The kernel socket code is no doubt enjoying watching us squirm.