http://d.puremagic.com/issues/show_bug.cgi?id=10485

           Summary: can not distinguish method call in string mixin!
           Product: D
           Version: D2
          Platform: All
        OS/Version: Windows
            Status: NEW
          Severity: blocker
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: changlon@gmail.com


--- Comment #0 from changlon <changlon@gmail.com> 2013-06-26 21:20:23 PDT ---
code:
---------------
class TestClass{
    void call(){
    }
}

mixin template test(string name){
    mixin("scope " ~ name ~ " = new TestClass;" );
    mixin( name ~ ".call();" );
}

void main(){
    mixin test!("var");
    var.call();
}
---------------

error:
--------------
debug.d(10): Error: function declaration without return type. (Note that
constructors are always named 'this')
debug.d(10): Error: no identifier for declarator var.call()
debug.d(10): Error: function debug.TestClass.call is used as a type
debug.d(14): Error: mixin debug.main.test!("var") error instantiating
--------------

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--- Comment #1 from changlon <changlon@gmail.com> 2013-06-26 21:23:41 PDT ---
this seems is a     different but related bug:

code:
----------------------
class TestClass{}
mixin template test(string name){
    mixin("scope " ~ name ~ " = new TestClass;" );
}
void main(){
    mixin test!("var");
}
---------------------

run error:
--------------------
object.Error: Illegal Instruction
----------------
0x0012FE30
0x00402BFC
0x00402C37
0x00402835
0x00402098
0x7C817067 in RegisterWaitForInputIdle
--------------------

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Andrej Mitrovic <andrej.mitrovich@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |andrej.mitrovich@gmail.com
         Resolution|                            |INVALID


--- Comment #2 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2013-06-27 06:49:54 PDT ---
Templates can only be used to create declarations, not expressions. One workaround is to write the code like the following:

-----
import std.stdio;

class TestClass
{
    void call()
    {
        writeln("called");
    }
}

mixin template test(string name)
{
    struct S
    {
        void call()
        {
            scope tc = new TestClass;
            tc.call();
        }
    }

    mixin("S " ~ name ~ ";");
}

void main(){
    mixin test!("var");
    var.call();
}
-----

But note that 'scope' is a feature that will eventually be deprecated.

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--- Comment #3 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2013-06-27 06:50:57 PDT ---
(In reply to comment #1)
> this seems is a     different but related bug:
> 
> code:
> ----------------------
> class TestClass{}
> mixin template test(string name){
>     mixin("scope " ~ name ~ " = new TestClass;" );
> }
> void main(){
>     mixin test!("var");
> }
> ---------------------

It seems to be a bug related to scope, if you change it to 'auto' it will work. You could file this as a separate bug, but since scope is guaranteed to go away soon in a future release chances are low that it will be fixed.

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--- Comment #4 from changlon <changlon@gmail.com> 2013-06-27 18:49:17 PDT ---
Thanks for the quick response.

I will use that scope late, the struct wrapper will not work here.

I use this:

-----
string test(string name, alias T1)(){
    string code    = "scope " ~ name ~ " = new ubyte[ " ~ T1.stringof~ ".length
+ 1 ];\n" ;
    code    ~= data ~ "[$-1] = 0;\n" ;
    return code ;
}
void main(strings args){
    mixin( test!("var",  args[0]) ) ;
    capi_call(var.ptr);
}
----

I will create bug for scope mixin.

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