Mismatching of `quote!` with `quote_spanned!` in some macros

[jebrosen]

https://github.com/rust-lang/rust/pull/68716 would change the default for quote! from call_site to mixed_site. As expected there is some breakage, but it looks like the breakage caused by devise specifically is "legitimate" and caused by mismatching quote! with quote_spanned!. For example:

https://github.com/SergioBenitez/Devise/blob/c4f110f03f3d2cceb470981d87a5bbd50340ee84/codegen/src/lib.rs#L74

is in a quote_spanned! invocation, but

https://github.com/SergioBenitez/Devise/blob/c4f110f03f3d2cceb470981d87a5bbd50340ee84/codegen/src/lib.rs#L120

is in a quote! invocation.

My opinion is that these should be realigned such that quote! is used consistently for variables such as __list, which should work even after a switch to mixed_site.

[petrochenkov]

Clarification: https://github.com/rust-lang/rust/pull/68716 itself won't change the meaning of quote!, but the next version of quote may use Span::mixed_site by default once it's stabilized.

So this issue need to be addressed sometime before migrating devise to that hypothetical future version of quote rather than immediately.

[jebrosen]

Ah - thanks for that clarification.