[Issue 8161] New: -property should give an error for invalid property functions

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=8161

           Summary: -property should give an error for invalid property
                    functions
           Product: D
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: jmdavisProg at gmx.com


--- Comment #0 from Jonathan M Davis <jmdavisProg at gmx.com> 2012-05-29 22:36:00 PDT ---
This code compiles with -property:

struct S
{
    @property void prop()
    {
    }
}

void main()
{
}


It makes no sense that it would. prop returns nothing, so it can't be used as a
getter, and it takes nothing, so it can't be used as a setter. Neither

S s;
auto a = s.prop;

nor

s.prop = a;

would compile, so there's no point in letting prop compile with @property.
Another example would be a function like

struct S
{
    @property void prop(int a, int b)
    {
    }
}

It can't possibly be used as a property function either. I'd argue that any
such function should be considered an error as long as it's marked as @property
and the -property flag is used.

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