[Clarification] No warning reported if object is not set

[nselvara]

As an addendum to this issue: #298
If one doesn't use/set the object (port, signal, variable), VHDL-LS correctly flags a warning that it's not set - all good :) .
However, if the object is used for example as bla'sig_obj'subtype then the warning goes away even though the object is kind of not set. I'm not sure if that's a desirable feature to also output warning if the signal is not set rather than just used to get meta data.

[Schottkyc137]

It's a good question whether this should be marked as an unused declaration or not. rust-analyzer does something similar when a variable is only used in recursion, so maybe vhdl_ls should emit an error in a similar fashion?

[nselvara]

Or maybe, we introduce 2 kind of flags, which then indicates that the object is only used as a reference and the other one remains the same if it's not used.

[nselvara]

I found another one that's related to this:

This one flags that the index is not used.

variable bla: boolean;

function ret_bla(index: natural) return boolean is begin
  return true;
end function;

bla := ret_bla(0);

However, if you write the usage like this:

bla := ret_bla(index => 0);

The warning goes away even though the index is not used really.