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warning: use of a double negation
--> $DIR/lint-double-negations-macro.rs:9:9
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LL | --$e
| ^^^^
...
LL | bad_macro!(1);
| ------------- in this macro invocation
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= note: the prefix `--` could be misinterpreted as a decrement operator which exists in other languages
= note: use `-= 1` if you meant to decrement the value
= note: `#[warn(double_negations)]` on by default
= note: this warning originates in the macro `bad_macro` (in Nightly builds, run with -Z macro-backtrace for more info)
help: add parentheses for clarity
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LL | -(-$e)
| + +
warning: 1 warning emitted
|
