import std.stdio;

void test(ushort market, void delegate(ushort market, char* pc) callback)
{
    for (auto i = 0; i < 10; i++)
    {
        callback(cast(ushort) i, cast(char*) null);
    }
}

void main()
{
    test(cast(ushort) 1, (m, c) => writeln(m));
    //test(cast(ushort) 1, (m, c) => { writeln(m); });
    test(cast(ushort) 1, (ushort m, char* c) => writeln(m));
    //test(cast(ushort) 1, (ushort m, char* c) => { writeln(m); });
}

On Monday, 9 October 2017 at 14:34:48 UTC, Zhuo Nengwen wrote:
>     //test(cast(ushort) 1, (m, c) => { writeln(m); });

That's a function that returns a function.

Perhaps you meant to just remove the => and be left with a multi-line function.

On Monday, 9 October 2017 at 14:54:33 UTC, Adam D. Ruppe wrote:
>>     //test(cast(ushort) 1, (m, c) => { writeln(m); });
>
> That's a function that returns a function.
>
> Perhaps you meant to just remove the => and be left with a multi-line function.

I simplified the test codes. I want write mode codes in closure, such as:

test(cast(ushort) 1, (m, c) => {
  writeln(m);
  writeln(m);
});

On Monday, 9 October 2017 at 15:15:48 UTC, Zhuo Nengwen wrote:
> test(cast(ushort) 1, (m, c) => {
>   writeln(m);
>   writeln(m);
> });

Just remove the =>

(m, c) {
  // code here
}

On Monday, 9 October 2017 at 15:22:54 UTC, Adam D. Ruppe wrote:
> On Monday, 9 October 2017 at 15:15:48 UTC, Zhuo Nengwen wrote:
>> test(cast(ushort) 1, (m, c) => {
>>   writeln(m);
>>   writeln(m);
>> });
>
> Just remove the =>
>
> (m, c) {
>   // code here
> }

Common mistake from people who worked with LINQ in C#.