rust/tests/ui/try_err.fixed

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2019-06-25 03:28:46 +02:00
// run-rustfix
#![deny(clippy::try_err)]
// Tests that a simple case works
// Should flag `Err(err)?`
pub fn basic_test() -> Result<i32, i32> {
let err: i32 = 1;
if true { // To avoid warnings during rustfix
return Err(err);
}
Ok(0)
}
// Tests that `.into()` is added when appropriate
pub fn into_test() -> Result<i32, i32> {
let err: u8 = 1;
if true { // To avoid warnings during rustfix
return Err(err.into());
}
Ok(0)
}
// Tests that tries in general don't trigger the error
pub fn negative_test() -> Result<i32, i32> {
Ok(nested_error()? + 1)
}
// Tests that `.into()` isn't added when the error type
// matches the surrounding closure's return type, even
// when it doesn't match the surrounding function's.
pub fn closure_matches_test() -> Result<i32, i32> {
let res: Result<i32, i8> = Some(1).into_iter()
.map(|i| {
let err: i8 = 1;
if true { // To avoid warnings during rustfix
return Err(err);
}
Ok(i)
})
.next()
.unwrap();
Ok(res?)
}
// Tests that `.into()` isn't added when the error type
// doesn't match the surrounding closure's return type.
pub fn closure_into_test() -> Result<i32, i32> {
let res: Result<i32, i16> = Some(1).into_iter()
.map(|i| {
let err: i8 = 1;
if true { // To avoid warnings during rustfix
return Err(err.into());
}
Ok(i)
})
.next()
.unwrap();
Ok(res?)
}
fn nested_error() -> Result<i32, i32> {
Ok(1)
}
fn main() {
basic_test().unwrap();
into_test().unwrap();
negative_test().unwrap();
closure_matches_test().unwrap();
closure_into_test().unwrap();
}