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### What it does
This lint warns when you use `write!()` with a format
string that
ends in a newline.
### Why is this bad?
You should use `writeln!()` instead, which appends the
newline.
### Example
```
write!(buf, "Hello {}!\n", name);
```
Use instead:
```
writeln!(buf, "Hello {}!", name);
```
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