| // 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 { //~ opaque type expands to a recursive type |
| struct Foo<T>(T); |
| impl<T> Quux for Foo<T> {} |
| Foo(bar()) |
| } |
| |
| fn bar() -> impl Quux { //~ opaque type expands to a recursive 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(); } |
