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error[E0015]: cannot call non-const fn `<staged_api::Unstable as staged_api::MyTrait>::func` in constant functions
--> $DIR/staged-api-user-crate.rs:12:5
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LL | Unstable::func();
| ^^^^^^^^^^^^^^^^
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= note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
= help: add `#![feature(const_trait_impl)]` to the crate attributes to enable
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0015`.
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