Re: enum function can't be passed into template?

[Timon Gehr]

On 01/20/2013 03:21 PM, Zhenya wrote:
Hi!
Am I doing something wrong?
import std.stdio;

template gun(alias f)
{
     void gun()
     {
         f();
     }
}

void main()
{
     auto str = "hello";
     enum fun = (){writeln(str);};//replace enum -> auto to compile
     gun!fun();
}

Error:delegate c634.main.__lambda1 is a nested function and cannot be
accessed from c634.gun!(delegate @system void()
{
writeln(str);
}
).gun

I'd say it is a compiler bug. The following compiles and runs:

import std.stdio;

template gun(alias f, alias g){
    void gun(){
        f();
    }
}

void main(){
    int dummy;
    auto str="hello";
    enum fun=(){writeln(str);};
    gun!(fun,dummy)();
}

The issue is that 'fun' alone is treated as static by the compiler and 
therefore does not cause 'gun' to be instantiated locally inside main.

It is now a matter of whether a closure can be stored inside a local 
enum, which the spec is silent about. I think it should work. The 
compiler is in error in both cases.