rust/tests/ui/rfcs/rfc-2632-const-trait-impl/issue-102985.stderr

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error[E0015]: cannot call non-const closure in constants
--> $DIR/issue-102985.rs:6:14
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LL | n => n(),
| ^^^
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= note: closures need an RFC before allowed to be called in constants
= note: calls in constants are limited to constant functions, tuple structs and tuple variants
help: add `#![feature(effects)]` to the crate attributes to enable
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LL + #![feature(effects)]
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error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0015`.