1 1| |#![feature(generators, generator_trait)]
3 3| |use std::ops::{Generator, GeneratorState};
6 6| |// The following implementation of a function called from a `yield` statement
7 7| |// (apparently requiring the Result and the `String` type or constructor)
8 8| |// creates conditions where the `generator::StateTransform` MIR transform will
9 9| |// drop all `Counter` `Coverage` statements from a MIR. `simplify.rs` has logic
10 10| |// to handle this condition, and still report dead block coverage.
11 11| 1|fn get_u32(val: bool) -> Result<u32, String> {
12 12| 1| if val { Ok(1) } else { Err(String::from("some error")) }
17 16| 1| let is_true = std::env::args().len() == 1;
18 17| 1| let mut generator = || {
19 18| 1| yield get_u32(is_true);
23 22| 1| match Pin::new(&mut generator).resume(()) {
24 23| 1| GeneratorState::Yielded(Ok(1)) => {}
25 24| 0| _ => panic!("unexpected return from resume"),
27 26| 1| match Pin::new(&mut generator).resume(()) {
28 27| 1| GeneratorState::Complete("foo") => {}
29 28| 0| _ => panic!("unexpected return from resume"),