error[E0277]: the size for values of type `[isize]` cannot be known at compilation time --> $DIR/dst-bad-deep-2.rs:11:30 | LL | let h: &(([isize],),) = &(*g,); | ^^^^^ doesn't have a size known at compile-time | = help: within `(([isize],),)`, the trait `Sized` is not implemented for `[isize]`, which is required by `(([isize],),): Sized` = note: required because it appears within the type `([isize],)` = note: required because it appears within the type `(([isize],),)` = note: tuples must have a statically known size to be initialized error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0277`.