| // Test that attempts to construct infinite types via impl trait fail | |
| // in a graceful way. | |
| // | |
| // Regression test for #38064. | |
| trait Quux {} | |
| fn foo() -> impl Quux { //~ ERROR cannot resolve opaque type | |
| struct Foo<T>(T); | |
| impl<T> Quux for Foo<T> {} | |
| Foo(bar()) | |
| } | |
| fn bar() -> impl Quux { //~ ERROR cannot resolve opaque type | |
| struct Bar<T>(T); | |
| impl<T> Quux for Bar<T> {} | |
| Bar(foo()) | |
| } | |
| // effectively: | |
| // struct Foo(Bar); | |
| // struct Bar(Foo); | |
| // should produce an error about infinite size | |
| fn main() { foo(); } |