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### What it does
Checks for calls to [`splitn`]
(https://doc.rust-lang.org/std/primitive.str.html#method.splitn) and
related functions with either zero or one splits.
### Why is this bad?
These calls don't actually split the value and are
likely to be intended as a different number.
### Example
```
for x in s.splitn(1, ":") {
// ..
}
```
Use instead:
```
for x in s.splitn(2, ":") {
// ..
}
```
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