diff --git a/library/coretests/tests/convert.rs b/library/coretests/tests/convert.rs index f1048f4cf09cb..1eb7468e56ea7 100644 --- a/library/coretests/tests/convert.rs +++ b/library/coretests/tests/convert.rs @@ -14,3 +14,20 @@ fn convert() { const BAR: Vec = into(Vec::new()); assert_eq!(BAR, Vec::::new()); } + +#[test] +fn into_as_try_into() { + struct A; + struct B; + + impl Into for A { + fn into(self) -> B { + B + } + } + + // This wouldn't compile if the `TryInto`/`TryFrom` blanket impls used + // `U: From` instead of `T: Into` + let Ok(B) = A.try_into(); + let Ok(B) = B::try_from(A); +} diff --git a/tests/ui/never_type/try_from.rs b/tests/ui/never_type/try_from.rs deleted file mode 100644 index acde524e98f5b..0000000000000 --- a/tests/ui/never_type/try_from.rs +++ /dev/null @@ -1,37 +0,0 @@ -//@ run-pass -// This test relies on `TryFrom` being blanket impl for all `T: Into` -// and `TryInto` being blanket impl for all `U: TryFrom` - -// This test was added to show the motivation for doing this -// over `TryFrom` being blanket impl for all `T: From` - -#![feature(never_type)] - -use std::convert::{TryInto, Infallible}; - -struct Foo { - t: T, -} - -// This fails to compile due to coherence restrictions -// as of Rust version 1.32.x, therefore it could not be used -// instead of the `Into` version of the impl, and serves as -// motivation for a blanket impl for all `T: Into`, instead -// of a blanket impl for all `T: From` -/* -impl From> for Box { - fn from(foo: Foo) -> Box { - Box::new(foo.t) - } -} -*/ - -impl Into> for Foo { - fn into(self) -> Vec { - vec![self.t] - } -} - -pub fn main() { - let _: Result, Infallible> = Foo { t: 10 }.try_into(); -}