LYR-SEM0199

a 'var' that is written and never read

warning · spec 07-statements · lint unused-assignment, group unused, warn unless said

Every use of a var is the target of an assignment: what it stores is never read.

Explanation

A value stored and never read is work for nothing — often a forgotten use, or an assignment to the wrong name.

Read what the assignments store, or take them out with the binding. A store that a later one overwrites before a read is not looked for.

fn main(): void {
    var last = 0;
    last = 2;
}

import std.io { println };

fn main(): void {
    var last = 0;
    last = 2;
    println(last);
}