Incomplete Solution for quiz3

[SAVYAGOEL]

In quiz3 solution, I think it is incomplete, since ideally we shouldn't even allow to create a ReportCard with the grade attribute having value of type other than those that implement the Display trait, so in my opinion in the complete solution we should also put a Trait Bound in the definition of the struct ReportCard and modify it to struct ReportCard<T: Display>

[thely314]

(I used AI for translation because my native language is not English, and I hope it won't cause any misunderstandings)
You're correct from a technical perspective -- adding the trait bound at the struct level (struct ReportCard<T: Display>) would be a completely valid approach and in many cases would represent excellent practice.

In my opinion, keeping the struct definition unconstrained in the solution may be for specific tutorial reasons:

Focus on method-level constraints: This quiz may primarily aims to demonstrate how trait bounds can be applied to implementations rather than struct definitions;
Showcasing Rust's flexibility: This quiz may also wants to highlight how Rust allows different constraint granularity (struct-level vs method-level)
Maybe other contributers can cover struct-level trait bounds in subsequent new exercises? I guess.

Also I would like to submit a PR that only adds explanatory comments to the solution :)

[Vergesst]

Well, it will be better to add a Trait Constraint for ReportCard, I think. When it comes to ReportCard, most of us will regard it as a symbol of identity, just like id card... So it is sensible to change it into ReportCard<T: Display> or ReportCard<T> where T: Display, since that is the most common case when we use ReportCard...
So if this quiz is about flexbility of rust, a wrapper or something else used to wrap structs will be better, I think.