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tarpl: fix code and error in borrow splitting example to match the surronding text #27423

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Aug 1, 2015
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tarpl: fix code and error in borrow splitting example to match the surronding text #27423

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22 changes: 15 additions & 7 deletions src/doc/tarpl/borrow-splitting.md
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Original file line number Diff line number Diff line change
Expand Up @@ -27,19 +27,27 @@ However borrowck doesn't understand arrays or slices in any way, so this doesn't
work:

```rust,ignore
let x = [1, 2, 3];
let mut x = [1, 2, 3];
let a = &mut x[0];
let b = &mut x[1];
println!("{} {}", a, b);
```

```text
<anon>:3:18: 3:22 error: cannot borrow immutable indexed content `x[..]` as mutable
<anon>:3 let a = &mut x[0];
^~~~
<anon>:4:18: 4:22 error: cannot borrow immutable indexed content `x[..]` as mutable
<anon>:4 let b = &mut x[1];
^~~~
<anon>:4:14: 4:18 error: cannot borrow `x[..]` as mutable more than once at a time
<anon>:4 let b = &mut x[1];
^~~~
<anon>:3:14: 3:18 note: previous borrow of `x[..]` occurs here; the mutable borrow prevents subsequent moves, borrows, or modification of `x[..]` until the borrow ends
<anon>:3 let a = &mut x[0];
^~~~
<anon>:6:2: 6:2 note: previous borrow ends here
<anon>:1 fn main() {
<anon>:2 let mut x = [1, 2, 3];
<anon>:3 let a = &mut x[0];
<anon>:4 let b = &mut x[1];
<anon>:5 println!("{} {}", a, b);
<anon>:6 }
^
error: aborting due to 2 previous errors
```

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