Getting enum from value

[Matthew Remmel via Digitalmars-d-learn]

I feel like I'm missing something, but there has to be an easier 
way to convert a value into an enum than switching over every 
possible value: i.e

enum Capitals {
    Indiana = "Indianapolis",
    Illinois = "Chicago",
    Ohio = "Columbus"
}

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Capitals enumFromValue(string s) {
    switch (s) {
        case Capitals.Indiana:
            return Capitals.Indiana;
         case Capitals.Illinois:
            return Capitals.Illinois;
         case Capitals.Ohio:
            return Capitals.Ohio;
         default:
             throw new Exception(format("No Capitals enum member 
with value %s", s));
    }
}

int main() {
    Capitals c = enumFromValue("Chicago"); // works

    // I tried using std.conv, but it matches on the enum member 
name
    c = to!Capitals("Chicago") // fails, no member named Chicago
}

With how redundant the enumFromValue(string) implementation is, I 
would think there would be an easier way to do it. I'm sure you 
could use a mixin, a template, or std.traits. I was hoping there 
was a more 'builtin' way to do it though. Something along the 
simplicity of:

int main() {
    Capitals c = Capitals("Chicago");
}

Any ideas?