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 ?

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?

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I cannot find where it impl trait `Display`

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