What are the possible operators for traits in a where clause in Rust?

Question

I\'m learning Rust and got to the chapter on trait bounds. In that chapter, they give an example with the + (plus) operator to enumerate all required traits in

Answer 1

'or' notation

No. Such a thing doesn't make sense to me — what would the code do if something could be A OR B?

brackets

No, unless you count the parenthesis in Fn(...) and friends, the use of angle brackets as generics (Vec) or the use of square brackets in slices ([u8]), but these are parts of types.

Again, such a request doesn't make sense to me, why would you need any kind of grouping?

negation

No. I believe this is due to the fact that handling negative logic makes things a lot more complicated.

other operators

There's the ? (question mark) bound.

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Source: I've written a parser of Rust code. While it's possible I've missed something, it parses all the ~37500 Rust files I've thrown at it, so it's a pretty good fit.