Merge commit 'b52fb5234cd7c11ecfae51897a6f7fa52e8777fc' into clippyup

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diff --git a/src/docs/overflow_check_conditional.txt b/src/docs/overflow_check_conditional.txt
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+### What it does
+Detects classic underflow/overflow checks.
+
+### Why is this bad?
+Most classic C underflow/overflow checks will fail in
+Rust. Users can use functions like `overflowing_*` and `wrapping_*` instead.
+
+### Example
+```
+a + b < a;
+```
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