UFCS not working with alias

[rikki cattermole via Digitalmars-d-learn]

On 07/09/2016 8:26 PM, Andre Pany wrote:
> On Wednesday, 7 September 2016 at 08:08:34 UTC, rikki cattermole wrote:
>> On 07/09/2016 8:06 PM, Andre Pany wrote:
>>>
>>> Should I open an enhancement request?
>>
>> No.
>> It works outside of the function (part of lookup rules).
>
> I simplified my example too much. Yes in the example above I can move
> the alias
> outside the main function. Here is a more complex example.
>
> As I use the input parameter args in the alias, I cannot move the alias
> outside
> the main function.
>
> import std.algorithm;
> bool fulfillsKeyPredicate(string s, string t) {return true;}
>
> void main(string[] args)
> {
>     alias keyPredicateFilter = filter!(e =>
> e.fulfillsKeyPredicate(args[0]));
>     string[] arr;
>
>     keyPredicateFilter(arr);
>     arr.keyPredicateFilter;
> }
>
> Is there a workaround? Or is still a valid scenario to change the lookup
> rules?

People have tried, this is the behavior as designed.

The workaround is simple, don't use UFCS.

I won't repeat the explanation or reasoning here, plenty of posts on it ;)