error[E0107]: missing generics for struct `Box` --> $DIR/issue-14092.rs:1:11 | LL | fn fn1(0: Box) {} | ^^^ expected at least 1 generic argument | note: struct defined here, with at least 1 generic parameter: `T` --> $SRC_DIR/alloc/src/boxed.rs:LL:COL | LL | pub struct Box< | ^^^ LL | T: ?Sized, | - help: add missing generic argument | LL | fn fn1(0: Box) {} | ~~~~~~ error: aborting due to previous error For more information about this error, try `rustc --explain E0107`.