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error[E0658]: specialization is unstable
--> $DIR/track6.rs:LL:CC
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LL | default fn bar() {}
| ^^^^^^^^^^^^^^^^^^^
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= note: -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= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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`.
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