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Add autoderef and autoref tests for future_prelude_collision lint

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jam1garner 2021-05-27 13:38:06 -04:00 committed by Niko Matsakis
parent 327697a540
commit eb5e0af3a9
3 changed files with 47 additions and 5 deletions
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15
src/test/ui/lint/future-prelude-collision.fixed
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@ -12,6 +12,13 @@ impl TryIntoU32 for u8 {
}
}
// needed for autoref test
impl TryIntoU32 for &f32 {
fn try_into(self) -> Result<u32, ()> {
Ok(*self as u32)
}
}
trait TryFromU8: Sized {
fn try_from(x: u8) -> Result<Self, ()>;
}
@ -54,4 +61,12 @@ fn main() {
// test type omission
let _: u32 = <_ as TryFromU8>::try_from(3u8).unwrap();
//~^ WARNING trait-associated function `try_from` will become ambiguous in Rust 2021
// test autoderef
let _: u32 = TryIntoU32::try_into(*(&3u8)).unwrap();
//~^ WARNING trait method `try_into` will become ambiguous in Rust 2021
// test autoref
let _: u32 = TryIntoU32::try_into(&3.0).unwrap();
//~^ WARNING trait method `try_into` will become ambiguous in Rust 2021
}

15
src/test/ui/lint/future-prelude-collision.rs
View file

@ -12,6 +12,13 @@ impl TryIntoU32 for u8 {
}
}
// needed for autoref test
impl TryIntoU32 for &f32 {
fn try_into(self) -> Result<u32, ()> {
Ok(*self as u32)
}
}
trait TryFromU8: Sized {
fn try_from(x: u8) -> Result<Self, ()>;
}
@ -54,4 +61,12 @@ fn main() {
// test type omission
let _: u32 = <_>::try_from(3u8).unwrap();
//~^ WARNING trait-associated function `try_from` will become ambiguous in Rust 2021
// test autoderef
let _: u32 = (&3u8).try_into().unwrap();
//~^ WARNING trait method `try_into` will become ambiguous in Rust 2021
// test autoref
let _: u32 = 3.0.try_into().unwrap();
//~^ WARNING trait method `try_into` will become ambiguous in Rust 2021
}

22
src/test/ui/lint/future-prelude-collision.stderr
View file

@ -1,5 +1,5 @@
warning: trait method `try_into` will become ambiguous in Rust 2021
--> $DIR/future-prelude-collision.rs:40:18
--> $DIR/future-prelude-collision.rs:47:18
|
LL | let _: u32 = 3u8.try_into().unwrap();
| ^^^^^^^^^^^^^^ help: disambiguate the associated function: `TryIntoU32::try_into(3u8)`
@ -7,22 +7,34 @@ LL | let _: u32 = 3u8.try_into().unwrap();
= note: `#[warn(future_prelude_collision)]` on by default
warning: trait-associated function `try_from` will become ambiguous in Rust 2021
--> $DIR/future-prelude-collision.rs:44:13
--> $DIR/future-prelude-collision.rs:51:13
|
LL | let _ = u32::try_from(3u8).unwrap();
| ^^^^^^^^^^^^^ help: disambiguate the associated function: `<u32 as TryFromU8>::try_from`
warning: trait-associated function `from_iter` will become ambiguous in Rust 2021
--> $DIR/future-prelude-collision.rs:48:13
--> $DIR/future-prelude-collision.rs:55:13
|
LL | let _ = <Vec<u8>>::from_iter(vec![1u8, 2, 3, 4, 5, 6].into_iter());
| ^^^^^^^^^^^^^^^^^^^^ help: disambiguate the associated function: `<Vec<u8> as FromByteIterator>::from_iter`
warning: trait-associated function `try_from` will become ambiguous in Rust 2021
--> $DIR/future-prelude-collision.rs:55:18
--> $DIR/future-prelude-collision.rs:62:18
|
LL | let _: u32 = <_>::try_from(3u8).unwrap();
| ^^^^^^^^^^^^^ help: disambiguate the associated function: `<_ as TryFromU8>::try_from`
warning: 4 warnings emitted
warning: trait method `try_into` will become ambiguous in Rust 2021
--> $DIR/future-prelude-collision.rs:66:18
|
LL | let _: u32 = (&3u8).try_into().unwrap();
| ^^^^^^^^^^^^^^^^^ help: disambiguate the associated function: `TryIntoU32::try_into(*(&3u8))`
warning: trait method `try_into` will become ambiguous in Rust 2021
--> $DIR/future-prelude-collision.rs:70:18
|
LL | let _: u32 = 3.0.try_into().unwrap();
| ^^^^^^^^^^^^^^ help: disambiguate the associated function: `TryIntoU32::try_into(&3.0)`
warning: 6 warnings emitted