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docs: Make some changes in texts

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In my understanding, the description is somehow inappropriate.
This commit is contained in:
Tang Chenglong 2016-03-21 21:00:04 +08:00
parent 7ec8f5c369
commit a5d9057ca7
1 changed files with 3 additions and 3 deletions
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6
src/doc/book/match.md
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@ -36,10 +36,10 @@ give us an error:
error: non-exhaustive patterns: `_` not covered
```
Rust is telling us that we forgot a value. The compiler infers from `x` that it
can have any positive 32bit value; for example 1 to 2,147,483,647. The `_` acts
Rust is telling us that we forgot some value. The compiler infers from `x` that it
can have any 32bit integer value; for example -2,147,483,648 to 2,147,483,647. The `_` acts
as a 'catch-all', and will catch all possible values that *aren't* specified in
an arm of `match`. As you can see with the previous example, we provide `match`
an arm of `match`. As you can see in the previous example, we provide `match`
arms for integers 1-5, if `x` is 6 or any other value, then it is caught by `_`.
`match` is also an expression, which means we can use it on the right-hand