Merge commit 'b52fb5234cd7c11ecfae51897a6f7fa52e8777fc' into clippyup

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diff --git a/src/docs/single_element_loop.txt b/src/docs/single_element_loop.txt
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+### What it does
+Checks whether a for loop has a single element.
+
+### Why is this bad?
+There is no reason to have a loop of a
+single element.
+
+### Example
+```
+let item1 = 2;
+for item in &[item1] {
+    println!("{}", item);
+}
+```
+
+Use instead:
+```
+let item1 = 2;
+let item = &item1;
+println!("{}", item);
+```
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