27 lines
805 B
Rust
27 lines
805 B
Rust
|
//@ revisions: current next
|
||
|
|
//@ ignore-compare-mode-next-solver (explicit revisions)
|
||
|
|
//@[next] compile-flags: -Znext-solver
|
||
|
|
//@[next] check-pass
|
||
|
|
|
||
|
|
// #136824 changed cycles to be coinductive if they have at least
|
||
|
|
// one productive step, causing this test to pass with the new solver.
|
||
|
|
//
|
||
|
|
// The cycle in the test is the following:
|
||
|
|
// - `Foo<T>: Send`, impl requires
|
||
|
|
// - `T: SendIndir<Foo<T>>`, impl requires
|
||
|
|
// - `Foo<T>: Send` cycle
|
||
|
|
//
|
||
|
|
// The old solver treats this cycle as inductive due to the `T: SendIndir` step.
|
||
|
|
|
||
|
|
struct Foo<T>(T);
|
||
|
|
unsafe impl<T: SendIndir<Foo<T>>> Send for Foo<T> {}
|
||
|
|
|
||
|
|
trait SendIndir<T> {}
|
||
|
|
impl<T, U: Send> SendIndir<U> for T {}
|
||
|
|
|
||
|
|
fn is_send<T: Send>() {}
|
||
|
|
fn main() {
|
||
|
|
is_send::<Foo<u32>>();
|
||
|
|
//[current]~^ ERROR overflow evaluating the requirement `u32: SendIndir<Foo<u32>>`
|
||
|
|
}
|