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error[E0658]: specialization is unstable (see issue #31844)
--> $DIR/specialization-feature-gate-default.rs:7:1
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LL | / default impl<T> Foo for T {
LL | | fn foo(&self) {}
LL | | }
| |_^
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= 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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