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doc: Fix the 30-minute intro to use += operator. #16247

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Aug 5, 2014
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doc: Fix the 30-minute intro to use += operator. #16247

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7 changes: 4 additions & 3 deletions src/doc/intro.md
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Original file line number Diff line number Diff line change
Expand Up @@ -359,10 +359,11 @@ fn main() {
// Take the lock, along with exclusive access to the underlying array
let mut numbers = numbers_lock.lock();
// This is ugly for now, but will be replaced by
// `numbers[num as uint] += 1` in the near future.
// This is ugly for now because of the need for `get_mut`, but
// will be replaced by `numbers[num as uint] += 1`
// in the near future.
// See: https://github.com/rust-lang/rust/issues/6515
*numbers.get_mut(num as uint) = *numbers.get_mut(num as uint) + 1;
*numbers.get_mut(num as uint) += 1;
println!("{}", (*numbers)[num as uint]);
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