error[E0282]: type annotations needed for `[usize; _]` --> $DIR/issue-83606.rs:8:9 | LL | let _ = foo("foo"); | ^ | help: consider giving this pattern a type, where the the value of const parameter `N` is specified | LL | let _: [usize; _] = foo("foo"); | ++++++++++++ error: aborting due to previous error For more information about this error, try `rustc --explain E0282`.