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error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
  --> $DIR/cannot-call-unsized-via-ptr.rs:5:24
   |
LL |     let f: fn([u8]) = |_result| {};
   |                        ^^^^^^^ doesn't have a size known at compile-time
   |
   = help: the trait `Sized` is not implemented for `[u8]`
   = note: all function arguments must have a statically known size

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.