Hi
I was trying out the following code and ran into an error.
fn main() {
let a = [12;500];
let b = [15;5];
println!("{:?}",a );
println!("{:?}",b );
}
error[E0277]: the trait bound `[{integer}; 500]: std::fmt::Debug` is not
satisfied
--> src\main.rs:37:17
|
37 | println!("{:?}",a );
| ^ `[{integer}; 500]` cannot be formatted using `:?`; if it
is defined in your crate, add `#[derive(Debug)]` or manually implement it
|
= help: the trait `std::fmt::Debug` is not implemented for `[{integer}; 500]`
= note: required by `std::fmt::Debug::fmt`
>From https://doc.rust-lang.org/std/primitive.array.html
This limitation on the size N exists because Rust does not yet support code
that is generic over the size of an array type. [Foo; 3] and [Bar; 3] are
instances of same generic type [T; 3], but [Foo; 3] and [Foo; 5] are entirely
different types. As a stopgap, trait implementations are statically generated
up to size 32.
Could anyone please shed some light on this concept/limitation, I cant wrap my
head around this.
--
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