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error: generic parameters may not be used in const operations
--> $DIR/feature-gate-generic_const_exprs.rs:1:33
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LL | type Arr<const N: usize> = [u8; N - 1];
| ^ cannot perform const operation using `N`
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= help: const parameters may only be used as standalone arguments, i.e. `N`
= help: use `#![feature(generic_const_exprs)]` to allow generic const expressions
error: aborting due to previous error
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