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Make an example more clear with sample code. #15121

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Jun 25, 2014
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Make an example more clear with sample code. #15121

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11 changes: 8 additions & 3 deletions src/doc/tutorial.md
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Expand Up @@ -559,9 +559,14 @@ tuple, introducing two variables at once: `a` and `b`.
let (a, b) = get_tuple_of_two_ints();
~~~~

Let bindings only work with _irrefutable_ patterns: that is, patterns
that can never fail to match. This excludes `let` from matching
literals and most `enum` variants.
Let bindings only work with _irrefutable_ patterns: that is, patterns that can
never fail to match. This excludes `let` from matching literals and most `enum`
variants as binding patterns, since most such patterns are not irrefutable. For
example, this will not compile:

~~~~{ignore}
let (a, 2) = (1, 2);
~~~~

## Loops

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