Compilare: warning: unused variable: `needs_to_be_here` --> main.rs:23:9 | 23 | let needs_to_be_here = vec![0u32; 5_000_000]; | ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_needs_to_be_here` | = note: `#[warn(unused_variables)]` on by default warning: function `split_in_x_var` is never used --> main.rs:5:4 | 5 | fn split_in_x_var<T: FromStr, U: FromIterator<T>>(string: &str) -> U where T::Err: Debug { | ^^^^^^^^^^^^^^ | = note: `#[warn(dead_code)]` on by default warning: 2 warnings emitted