error[E0107]: missing generics for struct `Box`
  --> $DIR/issue-14092.rs:1:11
   |
LL | fn fn1(0: Box) {}
   |           ^^^ expected at least 1 type argument
   |
note: struct defined here, with at least 1 type parameter: `T`
  --> $SRC_DIR/alloc/src/boxed.rs:LL:COL
   |
LL | pub struct Box<
   |            ^^^
LL |     T: ?Sized,
   |     -
help: use angle brackets to add missing type argument
   |
LL | fn fn1(0: Box<T>) {}
   |              ^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0107`.