4a8d2e3856
improve format impl for literals The basic idea of this change can be seen here https://godbolt.org/z/MT37cWoe1. Updates the format impl to have a fast path for string literals and the default path for regular format args. This change will allow `format!("string literal")` to be used interchangably with `"string literal".to_owned()`. This would be relevant in the case of `f!"string literal"` being legal (https://github.com/rust-lang/rfcs/pull/3267) in which case it would be the easiest way to create owned strings from literals, while also being just as efficient as any other impl |
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