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fix compile error if missing extern create rand; #1659

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fix compile error if missing extern create rand; #1659

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3 changes: 3 additions & 0 deletions src/ch02-00-guessing-game-tutorial.md
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Original file line number Diff line number Diff line change
Expand Up @@ -515,6 +515,7 @@ Now that you’ve added the `rand` crate to *Cargo.toml*, let’s start using
<span class="filename">Filename: src/main.rs</span>

```rust,ignore
extern create rand;
use std::io;
use rand::Rng;

Expand Down Expand Up @@ -603,6 +604,7 @@ will explain.
<span class="filename">Filename: src/main.rs</span>

```rust,ignore,does_not_compile
extern create rand;
use std::io;
use std::cmp::Ordering;
use rand::Rng;
Expand Down Expand Up @@ -967,6 +969,7 @@ secret number. Listing 2-6 shows the final code.
<span class="filename">Filename: src/main.rs</span>

```rust,ignore
extern create rand;
use std::io;
use std::cmp::Ordering;
use rand::Rng;
Expand Down