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Add test of #[from] on optional source

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David Tolnay 2021-08-28 15:43:30 -07:00
parent b087faf217
commit 6159aba3b7
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1 changed files with 23 additions and 0 deletions
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23
tests/test_from.rs
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@ -14,10 +14,21 @@ pub struct ErrorStruct {
source: io::Error,
}
#[derive(Error, Debug)]
#[error("...")]
pub struct ErrorStructOptional {
#[from]
source: Option<io::Error>,
}
#[derive(Error, Debug)]
#[error("...")]
pub struct ErrorTuple(#[from] io::Error);
#[derive(Error, Debug)]
#[error("...")]
pub struct ErrorTupleOptional(#[from] Option<io::Error>);
#[derive(Error, Debug)]
#[error("...")]
pub enum ErrorEnum {
@ -27,6 +38,15 @@ pub enum ErrorEnum {
},
}
#[derive(Error, Debug)]
#[error("...")]
pub enum ErrorEnumOptional {
Test {
#[from]
source: Option<io::Error>,
},
}
#[derive(Error, Debug)]
#[error("...")]
pub enum Many {
@ -39,7 +59,10 @@ fn assert_impl<T: From<io::Error>>() {}
#[test]
fn test_from() {
assert_impl::<ErrorStruct>();
assert_impl::<ErrorStructOptional>();
assert_impl::<ErrorTuple>();
assert_impl::<ErrorTupleOptional>();
assert_impl::<ErrorEnum>();
assert_impl::<ErrorEnumOptional>();
assert_impl::<Many>();
}