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error: generic parameters may not be used in const operations
--> $DIR/issue-46511.rs:5:35
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LL | _a: [u8; std::mem::size_of::<&'a mut u8>()]
| ^^ cannot perform const operation using `'a`
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= note: lifetime parameters may not be used in const expressions
= help: use `#![feature(generic_const_exprs)]` to allow generic const expressions
error[E0392]: parameter `'a` is never used
--> $DIR/issue-46511.rs:3:12
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LL | struct Foo<'a>
| ^^ unused parameter
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= help: consider removing `'a`, referring to it in a field, or using a marker such as `PhantomData`
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0392`.
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