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Allow storing `format_args!()` in variable Fixes https://github.com/rust-lang/rust/issues/92698 Tracking issue for super let: https://github.com/rust-lang/rust/issues/139076 Tracking issue for format_args: https://github.com/rust-lang/rust/issues/99012 This change allows: ```rust let name = "world"; let f = format_args!("hello {name}!"); // New: Store format_args!() for later! println!("{f}"); ``` This will need an FCP. This implementation makes use of `super let`, which is unstable and might not exist in the future in its current form. However, it is entirely reasonable to assume future Rust will always have _a_ way of expressing temporary lifetimes like this, since the (stable) `pin!()` macro needs this too. (This was also the motivation for merging https://github.com/rust-lang/rust/pull/139114.) (This is a second version of https://github.com/rust-lang/rust/pull/139135)