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Auto merge of #24554 - tshepang:let-faq, r=steveklabnik

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bors 2015-04-19 03:42:59 +00:00
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src/doc/complement-design-faq.md
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@ -165,12 +165,13 @@ particularly easy to read.
## Why is `let` used to introduce variables?
We don't use the term "variable", instead, we use "variable bindings". The
simplest way for binding is the `let` syntax, other ways including `if let`,
`while let` and `match`. Bindings also exist in function arguments positions.
Instead of the term "variable", we use "variable bindings". The
simplest way for creating a binding is by using the `let` syntax.
Other ways include `if let`, `while let`, and `match`. Bindings also
exist in function argument positions.
Bindings always happen in pattern matching positions, and it's also Rust's way
to declare mutability. One can also redeclare mutability of a binding in
to declare mutability. One can also re-declare mutability of a binding in
pattern matching. This is useful to avoid unnecessary `mut` annotations. An
interesting historical note is that Rust comes, syntactically, most closely
from ML, which also uses `let` to introduce bindings.