format_static!

[SoniEx2]

Between rust-lang/rust#78837 and rust-lang/rust#79150, we feel like a format_static!() macro would be useful. This would allow one to, for example:

#[doc = format_static!(include!("docs_for_foo.md"), $arg1, $arg2)]

or even just for replacing these occurrences of concat! with something more human-readable: https://github.com/rust-lang/rust/pull/79150/files#diff-28f62e401cacbc5959e8762c79a4e0417d52ab64b2cd4e19cafa0d9f7e1bbaeeR30

such that

#[doc = concat!("For example, `Option<", stringify!($Ty), ">` is the same size as `", stringify!($Int), "`:")]

becomes

#[doc = format_static!("For example, `Option<{}>` is the same size as `{}`:", stringify!($Ty), stringify!($Int))]

which doesn't require whoever is maintaining the thing to parse the stringify!() parts before being able to continue.

[mqudsi]

Does it even need to have a different name? I imagine that in a const attribute context format!(...) to be what you call format_static!(...) and not the std::fmt format!?

[SoniEx2]

maybe format_const! then? (it'd also work in const contexts and stuff)