Rollup merge of #158347 - rperier:diagnostic_on_const_format_arguments, r=mejrs Improve generic parameters handling for #[diagnostic::on_const] cc rust-lang/rust#155570 This Improves generic parameters handling for #[diagnostic::on_const] This is done by printing generics parameters when these are concrete Adt generics args. A lint is emitted we try to format a generic that is found anywhere. Moreover, generics parameters that are ty infer vars are no longer displayed "as-is", it is not clear and might be confusing, in this specific case the name of the generic parameter will be displayed instead. I will need some help for displaying the `Z`parameter correctly. From what I have understood, it is an `ty::Infer(ty::TyVar(_))` that is not correctly displayed via `self.tcx.short_string()` (in `on_unimplemented_components()`), or even not correctly inferred via `self.infcx.ty_to_string()`. EDIT: general descrition updated
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