#![allow(unused_assignments)] // failure-status: 1 fn call(return_error: bool) -> Result<(), ()> { if return_error { Err(()) } else { Ok(()) } } #[rustfmt::skip] fn test1() -> Result<(), ()> { let mut countdown = 10 ; for _ in 0..10 { countdown -= 1 ; if countdown < 5 { call(/*return_error=*/ true)?; call(/*return_error=*/ false)?; } else { call(/*return_error=*/ false)?; } } Ok(()) } struct Thing1; impl Thing1 { fn get_thing_2(&self, return_error: bool) -> Result { if return_error { Err(()) } else { Ok(Thing2 {}) } } } struct Thing2; impl Thing2 { fn call(&self, return_error: bool) -> Result { if return_error { Err(()) } else { Ok(57) } } } #[rustfmt::skip] fn test2() -> Result<(), ()> { let thing1 = Thing1{}; let mut countdown = 10 ; for _ in 0..10 { countdown -= 1 ; if countdown < 5 { thing1.get_thing_2(/*err=*/ false)?.call(/*err=*/ true).expect_err("call should fail"); thing1 . get_thing_2(/*return_error=*/ false) ? . call(/*return_error=*/ true) . expect_err( "call should fail" ); let val = thing1.get_thing_2(/*return_error=*/ true)?.call(/*return_error=*/ true)?; assert_eq!(val, 57); let val = thing1.get_thing_2(/*return_error=*/ true)?.call(/*return_error=*/ false)?; assert_eq!(val, 57); } else { let val = thing1.get_thing_2(/*return_error=*/ false)?.call(/*return_error=*/ false)?; assert_eq!(val, 57); let val = thing1 .get_thing_2(/*return_error=*/ false)? .call(/*return_error=*/ false)?; assert_eq!(val, 57); let val = thing1 .get_thing_2(/*return_error=*/ false) ? .call(/*return_error=*/ false) ? ; assert_eq!(val, 57); } } Ok(()) } #[rustfmt::skip] fn main() -> Result<(), ()> { test1().expect_err("test1 should fail"); test2() ? ; Ok(()) }