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

On Monday, 16 August 2021 at 14:14:27 UTC, DLearner wrote:

void main() {

   import std.stdio;

   size_t i;
   size_t j;

   i = 5;

   writeln("i = ",i);

}

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.

On Monday, 16 August 2021 at 14:14:27 UTC, DLearner wrote:

No in DMD but you can use D-Scanner for that. The check works reasonably as long as the variables are not introduced by mixin() or metaprog.

On Monday, 16 August 2021 at 14:14:27 UTC, DLearner wrote:

void main() {

   import std.stdio;

   size_t i;
   size_t j;

   i = 5;

   writeln("i = ",i);

}

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