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trpl/traits: Make error message consistent with source code snippet #25512

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May 19, 2015
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trpl/traits: Make error message consistent with source code snippet #25512

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55c8bac
Make error message consistent with source code
peferron May 17, 2015
a10d243
Use byte string literal syntax
peferron May 18, 2015
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11 changes: 6 additions & 5 deletions src/doc/trpl/traits.md
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Original file line number Diff line number Diff line change
Expand Up @@ -183,17 +183,17 @@ won’t have its methods:

```rust,ignore
let mut f = std::fs::File::open("foo.txt").ok().expect("Couldn’t open foo.txt");
let result = f.write("whatever".as_bytes());
let buf = b"whatever"; // byte string literal. buf: &[u8; 8]
let result = f.write(buf);
# result.unwrap(); // ignore the error
```

Here’s the error:

```text
error: type `std::fs::File` does not implement any method in scope named `write`

let result = f.write(b"whatever");
^~~~~~~~~~~~~~~~~~
let result = f.write(buf);
^~~~~~~~~~
```

We need to `use` the `Write` trait first:
Expand All @@ -202,7 +202,8 @@ We need to `use` the `Write` trait first:
use std::io::Write;

let mut f = std::fs::File::open("foo.txt").ok().expect("Couldn’t open foo.txt");
let result = f.write("whatever".as_bytes());
let buf = b"whatever";
let result = f.write(buf);
# result.unwrap(); // ignore the error
```

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