warning: unused variable: `x`
 --> ./ui-tests/lint/unused_vars.nil:4
4 |   let x = 0;
          ^
warning: unused variable: `y`
 --> ./ui-tests/lint/unused_vars.nil:17
17 |   let y = x;
           ^
warning: unused function parameter: `p`
 --> ./ui-tests/lint/unused_vars.nil:22
22 | function param(p: Int) = ;
                    ^