Merge commit 'b52fb5234cd7c11ecfae51897a6f7fa52e8777fc' into clippyup

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diff --git a/src/docs/while_let_loop.txt b/src/docs/while_let_loop.txt
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+### What it does
+Detects `loop + match` combinations that are easier
+written as a `while let` loop.
+
+### Why is this bad?
+The `while let` loop is usually shorter and more
+readable.
+
+### Known problems
+Sometimes the wrong binding is displayed ([#383](https://github.com/rust-lang/rust-clippy/issues/383)).
+
+### Example
+```
+loop {
+    let x = match y {
+        Some(x) => x,
+        None => break,
+    };
+    // .. do something with x
+}
+// is easier written as
+while let Some(x) = y {
+    // .. do something with x
+};
+```
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