DMD compiler - warning of unused variables

[jfondren]

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

dmd is anti-warning, so it'd have to be an error, which might be 
more annoying than it's worth. `dscanner --report thefile.d` 
includes "Variable j is never modified and could have been 
declared const or immutable." and "Variable j is never used." as 
issues, with line and column numbers.