error[E0277]: the size for values of type `(dyn AbstractRenderer + 'static)` cannot be known at compilation time
  --> $DIR/issue-18107.rs:4:5
   |
LL |     dyn AbstractRenderer
   |     ^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
   |
   = help: the trait `std::marker::Sized` is not implemented for `(dyn AbstractRenderer + 'static)`
   = note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
   = note: the return type of a function must have a statically known size

error: aborting due to previous error

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