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error[E0015]: cannot call non-const closure in constants
--> $DIR/issue-68542-closure-in-array-len.rs:6:13
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LL | a: [(); (|| { 0 })()]
| ^^^^^^^^^^^^
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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(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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