error[E0277]: the size for values of type `[i32]` cannot be known at compilation time --> $DIR/issue-20433.rs:6:18 | LL | fn iceman(c: Vec<[i32]>) {} | ^^^^^^^^^^ doesn't have a size known at compile-time | = help: the trait `Sized` is not implemented for `[i32]` note: required by a bound in `Vec` --> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL | LL | pub struct Vec { | ^ required by this bound in `Vec` error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.