Compile delegate with enum into proper function?

[Tejas]

On Sunday, 8 May 2022 at 01:38:55 UTC, jmh530 wrote:
> On Saturday, 7 May 2022 at 23:30:37 UTC, Paul Backus wrote:
>> [snip]
>>
>> Worth noting that you *can* write
>>
>> ```d
>> alias foo = partial!(foo, a);
>> ```
>>
>> ...which will add the partially-applied version to `foo`'s 
>> overload set.
>
> You sure about that? Below fails to compile on godbolt with ldc 
> 1.27.1 [1]. For some reason run.dlang.org is just hanging...
>
> ```d
> import core.stdc.stdio: printf;
> import std: partial;
>
> int foo(int x, int a) {
>  	return x + a;
> }
> enum int a = 2;
>
> alias foo = partial!(foo, a);
>
> void main() {
>     int x = 2;
>     int y = foo(x, a);
>     printf("the value of y is %i", y);
>     auto z = foo(x);
>     printf("the value of z is %i", z);
> }
> ```
>
> [1] https://d.godbolt.org/z/dx8aWfjYW

If there is only one possible value for the  overload, is there 
an issue with using default arguments?

```d
int foo(int x, int a = 1) {
     return x + a;
}

void main()
{
     import std.stdio:writeln;

     writeln(foo(5));
     writeln(foo(6, 7));
}

```