Document why not use concat! in dbg! macro #81233
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Thanks! @bors r+ rollup |
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Co-authored-by: Miguel Ojeda <ojeda@users.noreply.github.com>
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Rollup of 10 pull requests Successful merges: - rust-lang#80573 (Deny rustc::internal lints for rustdoc and clippy) - rust-lang#81173 (Expand docs on Iterator::intersperse) - rust-lang#81194 (Stabilize std::panic::panic_any.) - rust-lang#81202 (Don't prefix 0x for each segments in `dbg!(Ipv6)`) - rust-lang#81225 (Make 'docs' nullable in rustdoc-json output) - rust-lang#81227 (Remove doctree::StructType) - rust-lang#81233 (Document why not use concat! in dbg! macro) - rust-lang#81236 (Gracefully handle loop labels missing leading `'` in different positions) - rust-lang#81241 (Turn alloc's force_expr macro into a regular macro_rules.) - rust-lang#81242 (Enforce statically that `MIN_NON_ZERO_CAP` is calculated at compile time) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Original title: Reduce code generated by
dbg!macroThe expanded code before/after: https://rust.godbolt.org/z/hE3j95.
We cannot use
concat!sincefile!could contains{or the expression is a block ({ .. }).Using it will generated malformed format strings.
So let's document this reason why we don't use
concat!macro at all.