error[E0015]: cannot call non-const fn `::dim` in constants --> $DIR/issue-39559-2.rs:14:24 | LL | let array: [usize; Dim3::dim()] | ^^^^^^^^^^^ | = note: calls in constants are limited to constant functions, tuple structs and tuple variants = help: add `#![feature(const_trait_impl)]` to the crate attributes to enable error[E0015]: cannot call non-const fn `::dim` in constants --> $DIR/issue-39559-2.rs:16:15 | LL | = [0; Dim3::dim()]; | ^^^^^^^^^^^ | = note: calls in constants are limited to constant functions, tuple structs and tuple variants = help: add `#![feature(const_trait_impl)]` to the crate attributes to enable error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0015`.