[tOkeshu]

I generally find that using tuples of booleans this way is (sometimes) blurring the intent. Indeed, not only you have to keep in mind which boolean value correspond to which variable, but you also have to not forget what's the meaning of true and false here.

So what about the following?:

    match (width, margin_left, margin_right) {
        (auto, _, _) => { ... }
        (_, auto, auto) => { ... }
        (_, auto, _) => { ... }
        (_, _, auto) => { ... }
        (_, _, _) => { ... }
    }

Now that I write this, I can understand this style is trickier as the order here is critical. The "debate" between `match` and `if` reminds me of the same one that exists in Erlang, where I saw people more often use `case of` with booleans instead of `if`.

Moreover, is there any performance issue with matching auto for every tuple?

[mercurial]

I thought about aliasing true to width_is_auto/margin_right_is_auto, margin_left_is_auto, but sadly you don't seem to be able to use the aliases as patterns with my version of Rust.

[dbaupp]

Using static variables like

  static width_is_auto: bool = true;

should work.