| error[E0658]: specialization is unstable |
| --> $DIR/track6.rs:LL:CC |
| | |
| LL | default fn bar() {} |
| | ^^^^^^^^^^^^^^^^^^^ |
| -Ztrack-diagnostics: created at compiler/rustc_ast_passes/src/feature_gate.rs:LL:CC |
| | |
| = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information |
| = help: add `#![feature(specialization)]` to the crate attributes to enable |
| = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date |
| |
| error: aborting due to 1 previous error |
| |
| For more information about this error, try `rustc --explain E0658`. |
