DMD compiler - warning of unused variables

[russhy]

On Monday, 16 August 2021 at 14:14:27 UTC, DLearner wrote:
> Hi
>
> Please see code below:
> ```
> void main() {
>
>    import std.stdio;
>
>    size_t i;
>    size_t j;
>
>    i = 5;
>
>    writeln("i = ",i);
>
> }
>
> ```
>
> Is there a compiler option that would warn that variable 'j' is 
> defined but not used?
>
> Best regards

Hi, not compiler, but with dscanner it is possible, in fact with 
the code-d vscode extension, you get that out of the box with 
visual hints!

Take a look at this screenshot:

https://i.imgur.com/TGkgY3e.png

If you click on the line, it jumps automatically to the right 
line, very nice tooling