UFCS limit

[Antonio]

On Friday, 17 June 2022 at 01:04:28 UTC, Paul Backus wrote:
> On Thursday, 16 June 2022 at 23:59:06 UTC, Antonio wrote:
>> Is it there any way to apply UFCS on the returned method in 
>> the same expression?
>
> Nope. The way UFCS works is that allows you to call free 
> functions using member-function syntax, and member-function 
> syntax is always `object.memberName`, so UFCS only works for 
> functions that have a name, not anonymous functions.

Lets tray with a name :-)

```d
auto doSomething(string text)
{
   return (string text2)
   {
     import std.stdio;
     writeln(text,",",text2);
   };
}

void main()
{
   auto doHello = doSomething("Hello");
   doHello("X");
   "X".doHello();
}
```

Error:  onlineapp.d(16): Error: no property `doHello` for type 
`string`

It's true... the favomous "Rationale: Local function symbols are 
not considered by UFCS to avoid unexpected name conflicts."  (I 
consider it absurd... but I'n no-one)

Well lets try another possibility taking in account the power of 
CTFE

```d
auto doSomething(string text)
{
   return (string text2)
   {
     import std.stdio;
     writeln(text,",",text2);
   };
}

auto doHello = doSomething("Hello");

void main()
{
   doHello("X");
   "X".doHello();
}

```

Error: onlineapp.d(3): Error: closures are not yet supported in 
CTFE

:-/

UFCS vs Functional curring... nice battle :-)