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rust/library
Mara Bos 81a60b7aa8 Rollup merge of #81233 - lzutao:dbg, r=KodrAus
Document why not use concat! in dbg! macro

Original title: Reduce code generated by `dbg!` macro
The expanded code before/after: <https://rust.godbolt.org/z/hE3j95>.

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We cannot use `concat!` since `file!` 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.
2021-01-22 14:30:17 +00:00
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