where-it-impl-Display? &format!( "used non-generic {} `{}` for generic parameter", opaque_param.kind.descr(), arg, ), what i did I went to defination of arg,, it's GenericArg I check all impl for GenericArg I don't find Display but I can use .to_string() on it

[image] AndyJado: I went to defination of opaque_param.kind.descr(),, it's Region How certain are you that it's a -> Region rather than, say, a fn descr(&self) -> &'static str ?

That's was my mistake, I fixed the question now, I'm sorry. The Region in my first edition should be questioned with this LOC

But your link do forwarded me to the answer , thank you.

I cannot find where it impl trait `Display`

help

scottmcm September 20, 2022, 6:04am 2

How certain are you that it's a -> Region rather than, say, a fn descr(&self) -> &'static str?

Topic		Replies	Views
Approaches to some version of a blanket Display impl for types that impl MyTrait help	8	600	April 29, 2021
How to implement struct with Displayable attribute help	7	1527	August 22, 2020
Generic struct with Display bound on type parameters, borrowed by a function help	5	441	December 26, 2021
Impl Display for () help	18	1534	June 1, 2024
How to display generic function? help	2	2639	September 25, 2019

I cannot find where it impl trait `Display`

Related topics