Is it possible to execute a function inside .d script that has no main function?

[BoQsc]

On Thursday, 11 July 2019 at 10:41:38 UTC, Alex wrote:
> On Thursday, 11 July 2019 at 09:43:55 UTC, BoQsc wrote:
>> Here I have a file named: module.d
>>
>>>[...]
>>
>> There is no main() function since, I want to import this 
>> module, into another .d file.
>>
>> ( If I try to import and module.d does have main() function I 
>> get this error: )
>>> [...]
>>
>>
>>
>>
>>
>> I would like to launch function "interestingFunction()" 
>> directly using rdmd.
>> Is it possible to achieve that by any way?
>>
>>
>>
>>
>>
>> I tried to launch the whole file, but it gave me some weird 
>> output:
>>>[...]
>
> If you are trying to test a function separately from other 
> functions, e.g. for testing, then you are approaching unit 
> testing.
> You could write a unit test block just under the function to 
> test like
> unittest
> {
>   interestingFunction;
> }
>
> and launch it via rdmd... don't know the syntax right now. But 
> here is something:
> https://stackoverflow.com/questions/10694994/rdmd-is-not-running-unit-tests
>
> So, I assume something like
> rdmd -unittest --main module.d

Hmm, maybe I'll just rename module.d to module_library.d and 
place it in a folder,
then create a new module_run.d file that would launch the 
functions of module_library.d

> module\module_library.d
> module\module_run.d
> README.md

Maybe even place a README.md file explaining how I come up with 
this idea.

And when in need of executing it, I'll just type:
> rdmd module\module_run.d