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Fix discrepencies in the testing chapter #21865

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Feb 3, 2015
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Fix discrepencies in the testing chapter #21865

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6 changes: 2 additions & 4 deletions src/doc/trpl/testing.md
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Original file line number Diff line number Diff line change
Expand Up @@ -552,9 +552,7 @@ extern crate test;
# struct X;
# impl X { fn iter<T, F>(&self, _: F) where F: FnMut() -> T {} } let b = X;
b.iter(|| {
let mut n = 1000_u32;

test::black_box(&mut n); // pretend to modify `n`
let n = test::black_box(1000);

range(0, n).fold(0, |a, b| a ^ b)
})
Expand All @@ -569,7 +567,7 @@ Performing either of the above changes gives the following benchmarking results

```text
running 1 test
test bench_xor_1000_ints ... bench: 1 ns/iter (+/- 0)
test bench_xor_1000_ints ... bench: 131 ns/iter (+/- 3)

test result: ok. 0 passed; 0 failed; 0 ignored; 1 measured
```
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