>matching f64 by value
I wasn't thinking about matching floats by value, just destructuring a Point to obtain the coordinates as separate variables. Come to think of it though, as Rust already allows
let Point{x, y} = pl
there would be little benefit to allowing positional matching (and in fact it would create a nasty ambiguity). So yeah, as you said, you'd have to reserve the positional syntax for initialisation.
My overall point here isn't that Rust has made bad design decisions. It's just that the end result of a bunch of sensible design decisions is that initialising arrays of structs is clunky. It might well be that this problem isn't fixable without creating other, worse, problems. However, I think it's a problem that's emblematic of what the OP was talking about. We have here a language that's so concerned with solving difficult problems in clever ways that it's ended up backed into a corner when it comes to something as ridiculously simple as initialising an array of structs.
