| error: the compiler unexpectedly panicked. this is a bug. | |
| query stack during panic: | |
| #0 [evaluate_obligation] evaluating trait selection obligation `for<'a> {async fn body@$DIR/future.rs:33:35: 35:2}: core::future::future::Future` | |
| #1 [codegen_select_candidate] computing candidate for `<strlen as Trait>` | |
| end of query stack |