auto merge of #16720 : tshepang/rust/trailing-prompt, r=alexcrichton

because eyesore

diff --cc src/doc/guide.md
index 2828c3731fd7f19e8fb342bb259b7a7338f307de,2628617961d8fd370da859065a0b4344bdae4df8..b0b6720b1d105f485d1e8a27e95c705d686613e0
--- 1/src/doc/guide.md
--- 2/src/doc/guide.md
+++ b/src/doc/guide.md
@@@ -2362,10 -2358,9 +2358,9 @@@ $ ./target/guessing_gam
  Guess the number!
  The secret number is: 58
  Please input your guess.
 -  76  
 +  76
  You guessed: 76
  Too big!
- $
  ```
  
  Nice! You can see I even added spaces before my guess, and it still figured