src/test/ui/unsized/unsized-fn-arg.stderr

   1 error[E0277]: the size for values of type `T` cannot be known at compilation time
   2   --> $DIR/unsized-fn-arg.rs:5:17
   3    |
   4 LL | fn f<T: ?Sized>(t: T) {}
   5    |      -          ^ doesn't have a size known at compile-time
   6    |      |
   7    |      this type parameter needs to be `std::marker::Sized`
   8    |
   9    = help: unsized fn params are gated as an unstable feature
  10 help: consider removing the `?Sized` bound to make the type parameter `Sized`
  11    |
  12 LL - fn f<T: ?Sized>(t: T) {}
  13 LL + fn f<T>(t: T) {}
  14    |
  15 help: function arguments must have a statically known size, borrowed types always have a known size
  16    |
  17 LL | fn f<T: ?Sized>(t: &T) {}
  18    |                    +
  19
  20 error: aborting due to previous error
  21
  22 For more information about this error, try `rustc --explain E0277`.