Re: DMD compiler - warning of unused variables

[russhy via Digitalmars-d-learn]

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

Re: DMD compiler - warning of unused variables

[user1234 via Digitalmars-d-learn]

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


Is there a compiler option that would warn that variable 'j' is 
defined but not used?


Best regards


No in DMD but you can use 
[D-Scanner](https://code.dlang.org/packages/dscanner) for that. 
The check works reasonably as long as the variables are not 
introduced by `mixin()` or metaprog.

Re: DMD compiler - warning of unused variables

[jfondren via Digitalmars-d-learn]

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.

Re: DMD compiler - warning of unused variables

[rikki cattermole via Digitalmars-d-learn]

No.

https://github.com/dlang-community/D-Scanner#implemented-checks

DMD compiler - warning of unused variables

[DLearner via Digitalmars-d-learn]

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