Error: function `...` without `this` cannot be `const`

[Alexandru Ermicioi]

On Wednesday, 30 June 2021 at 20:12:29 UTC, H. S. Teoh wrote:
> On Wed, Jun 30, 2021 at 07:40:40PM +0000, someone via 
> Digitalmars-d-learn wrote: [...]
>>     @property int data() { return m_data; } // read property
> [...]
>> string something() @property { return this.whatever; }
> [...]
>> Now I am not sure which is the correct way.
> [...]
>
> Both are correct. :-)  It's up to personal style preference.
>
>
> T

Just to remark here, if you want to apply const to a return type 
put it inside brackets like: const(MyClass) foo(); otherwise 
compiler will try to apply it to 'this' parameter.

Best regards,
Alexandru.