default '==' on structs

[spir]

Hello,

What are the default semantics for '==' on structs?

I ask this because I was forced to write opEquals on a struct to get expected 
behaviour. This struct is basically:

struct Lexeme {
     string tag;
     string slice;
     Ordinal index;
}

Equal Lexeme's compare unequal using default '=='. When I add:

     const bool opEquals (ref const(Lexeme) l) {
         return (
                this.tag   == l.tag
             && this.slice == l.slice
             && this.index == l.index
         );
     }

then all works fine. What do I miss?

Denis
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