Issue with upstream

[Phil Bayfield]

I'm having some problems configuring upstream servers with localhost backup
(error page)

upstream backend1 {
    server 1.2.3.4;
    server 2.3.4.5;
    server localhost backup;
}

upstream backend2 {
    server 3.4.5.6;
    server 4.5.6.7;
}

Works, but:

upstream backend1 {
    server 1.2.3.4;
    server 2.3.4.5;
    server localhost backup;
}

upstream backend2 {
    server 3.4.5.6;
    server 4.5.6.7;
    server localhost backup;
}

Causes:

Testing nginx configuration: [emerg]: invalid parameter "backup"

Is this a bug?

Cheers
Phil.
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