rust/tests/run-coverage/while_early_ret.coverage

   LL|       |#![allow(unused_assignments)]
   LL|       |// failure-status: 1
   LL|       |
   LL|      1|fn main() -> Result<(),u8> {
   LL|      1|    let mut countdown = 10;
   LL|       |    while
   LL|      7|        countdown
   LL|      7|            >
   LL|      7|        0
   LL|       |    {
   LL|       |        if
   LL|      7|            countdown
   LL|      7|                <
   LL|      7|            5
   LL|       |        {
   LL|       |            return
   LL|       |                if
   LL|      1|                    countdown
   LL|      1|                        >
   LL|      1|                    8
   LL|       |                {
   LL|      0|                    Ok(())
   LL|       |                }
   LL|       |                else
   LL|       |                {
   LL|      1|                    Err(1)
   LL|       |                }
   LL|       |                ;
   LL|      6|        }
   LL|      6|        countdown
   LL|      6|            -=
   LL|      6|        1
   LL|       |        ;
   LL|       |    }
   LL|      0|    Ok(())
   LL|      1|}
   LL|       |
   LL|       |// ISSUE(77553): Originally, this test had `Err(1)` on line 22 (instead of `Ok(())`) and
   LL|       |// `std::process::exit(2)` on line 26 (instead of `Err(1)`); and this worked as expected on Linux
   LL|       |// and MacOS. But on Windows (MSVC, at least), the call to `std::process::exit()` exits the program
   LL|       |// without saving the InstrProf coverage counters. The use of `std::process:exit()` is not critical
   LL|       |// to the coverage test for early returns, but this is a limitation that should be fixed.