33 lines
829 B
Rust
33 lines
829 B
Rust
// compile-flags: -Znext-solver
|
|
#![feature(rustc_attrs)]
|
|
|
|
// A test showcasing that the solver may need to
|
|
// compute a goal which is already in the provisional
|
|
// cache.
|
|
//
|
|
// However, given that `(): BInd` and `(): B` are currently distinct
|
|
// goals, this is actually not possible right now.
|
|
//
|
|
// FIXME(-Znext-solver=coinductive): With the new coinduction approach
|
|
// the same goal stack can be both inductive and coinductive, depending
|
|
// on why we're proving a specific nested goal. Rewrite this test
|
|
// at that point.
|
|
|
|
#[rustc_coinductive]
|
|
trait A {}
|
|
|
|
#[rustc_coinductive]
|
|
trait B {}
|
|
trait BInd {}
|
|
impl<T: ?Sized + B> BInd for T {}
|
|
|
|
impl<T: ?Sized + BInd + B> A for T {}
|
|
impl<T: ?Sized + BInd> B for T {}
|
|
|
|
fn impls_a<T: A>() {}
|
|
|
|
fn main() {
|
|
impls_a::<()>();
|
|
//~^ ERROR overflow evaluating the requirement `(): A`
|
|
}
|