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1 ### What it does
2 Warns when using `push_str`/`insert_str` with a single-character string literal
3 where `push`/`insert` with a `char` would work fine.
4
5 ### Why is this bad?
6 It's less clear that we are pushing a single character.
7
8 ### Example
9 ```
10 string.insert_str(0, "R");
11 string.push_str("R");
12 ```
13
14 Use instead:
15 ```
16 string.insert(0, 'R');
17 string.push('R');
18 ```