[Lazarus] Confusing compiler hint on unused parameter

[Mattias Gaertner]

On Tue, 17 Feb 2015 16:54:59 +0100
Werner Pamler <werner.pamler at freenet.de> wrote:

> This compiler message looks strange to me: "tatextelements.pas(177,24) 
> Hint: Value parameter "AValue" is assigned but never used". It occurs 
> when TAChart is recompiled (see bug report #0027484). Here is the 
> corresponding code:
> 
> procedure TGenericChartMarks.SetFrame(AValue: _TFramePen);
> begin
>    if FFrame = AValue then exit;
>    FFrame.Assign(AValue);
>    StyleChanged(Self);
> end;
> 
> I would say that the parameter "AValue" *is* used. So, what is this hint 
> for?

This is a generic class. The compiler does not know at this point what
_TFramePen is. The hint sounds like a compiler bug.
Please report to FPC.

Mattias