Puppet users - Feb 2014 - Arrays and case statements

So I have a bunch of linux servers in different groups. Each server's group 
is defined as a custom fact. I want to set an array variable based on the 
server's group membership, so I have code like this:

case $servergroup {
    MAMMAL:  { $foo = ['horse', 'cow', 'dog'] }
    REPTILE: { $foo = ['gator', 'frog'] }
    BIRD:    { $foo = ['finch', 'chicken'] }
}

This works fine. The problem is that now I have a server that needs to be 
in two groups. I know I can convert a custom fact into an array like this:

$slist = split($servergroup, ',')

But I don't know how to have each value in the array be processed through 
the case statement. I tried this (using the future parser):

each($slist) |$val| { case $val {
    MAMMAL:  { $foo = ['horse', 'cow', 'dog'] }
    REPTILE: { $foo = ['gator', 'frog'] }
    BIRD:    { $foo = ['finch', 'chicken'] }
    }
}

But I just get an error.

(There's another issue, which is that I'll want the $foo array to append
to
the previous value rather than overwrite, but I'll deal with that after 
getting over this hurdle).

Is what I'm trying possible? Am I going about this totally the wrong way?

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