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### What it does
Checks for equal operands to comparison, logical and
bitwise, difference and division binary operators (`==`, `>`, etc., `&&`,
`||`, `&`, `|`, `^`, `-` and `/`).
### Why is this bad?
This is usually just a typo or a copy and paste error.
### Known problems
False negatives: We had some false positives regarding
calls (notably [racer](https://github.com/phildawes/racer) had one instance
of `x.pop() && x.pop()`), so we removed matching any function or method
calls. We may introduce a list of known pure functions in the future.
### Example
```
if x + 1 == x + 1 {}
// or
assert_eq!(a, a);
```
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