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error[E0282]: type annotations needed for `&[Foo<_>; _]`
  --> $DIR/no-conservative-copy-impl-requirement.rs:15:9
   |
LL |     let x = &[Foo::<_>; _];
   |         ^     -------- type must be known at this point
   |
help: consider giving `x` an explicit type, where the value of const parameter `N` is specified
   |
LL |     let x: &[Foo<N>; N] = &[Foo::<_>; _];
   |          ++++++++++++++

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0282`.