src/tools/clippy/src/docs/manual_instant_elapsed.txt

   1 ### What it does
   2 Lints subtraction between `Instant::now()` and another `Instant`.
   3
   4 ### Why is this bad?
   5 It is easy to accidentally write `prev_instant - Instant::now()`, which will always be 0ns
   6 as `Instant` subtraction saturates.
   7
   8 `prev_instant.elapsed()` also more clearly signals intention.
   9
  10 ### Example
  11 ```
  12 use std::time::Instant;
  13 let prev_instant = Instant::now();
  14 let duration = Instant::now() - prev_instant;
  15 ```
  16 Use instead:
  17 ```
  18 use std::time::Instant;
  19 let prev_instant = Instant::now();
  20 let duration = prev_instant.elapsed();
  21 ```