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Auto merge of #23186 - steveklabnik:gh14686, r=alexcrichton

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Fixes #14686
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bors 2015-03-10 03:03:17 +00:00
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src/doc/complement-design-faq.md
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@ -174,3 +174,10 @@ bindings.
See also [a long thread][alt] on renaming `let mut` to `var`.
[alt]: https://mail.mozilla.org/pipermail/rust-dev/2014-January/008319.html
## Why no `--x` or `x++`?
Preincrement and postincrement, while convenient, are also fairly complex. They
require knowledge of evaluation order, and often lead to subtle bugs and
undefined behavior in C and C++. `x = x + 1` or `x += 1` is only slightly
longer, but unambiguous.