Improve write! and writeln! error when called without destination Fixes rust-lang/rust#152493 Adds catch-all arms to `write!` and `writeln!` macros so that calling them without a destination (e.g., `write!("S")` instead of `write!(f, "S")`) gives a clear error instead of the cryptic "unexpected end of macro invocation" pointing at macro internals. r? @estebank |
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