| error[E0282]: type annotations needed | |
| --> $DIR/issue-16966.rs:2:5 | |
| | | |
| LL | panic!(std::default::Default::default()); | |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type for type parameter `M` | |
| | | |
| = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info) | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0282`. |