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error[E0658]: specialization is unstable
--> $DIR/specialization-feature-gate-default.rs:10:5
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LL | default fn foo(&self) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, see https://github.com/rust-lang/rust/issues/31844
= help: add #![feature(specialization)] to the crate attributes to enable
error: aborting due to previous error
For more information about this error, try `rustc --explain E0658`.
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