https://d.puremagic.com/issues/show_bug.cgi?id=12436

           Summary: Opaque struct parameter type should not be allowed
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: accepts-invalid
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: andrej.mitrovich@gmail.com


--- Comment #0 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2014-03-21 15:21:38 PDT ---
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struct Opaque;

Opaque ret_func();  // ok: error

void void_func(Opaque);  // no error!
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$ dmd test.d
test.d(3): Error: cannot return opaque struct Opaque by value

The void_func is not triggering errors, but it should.

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--- Comment #1 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2014-03-21 15:38:16 PDT ---
There are various other cases not caught yet, even for return types which are partially checked now. Examples:

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struct S;

S ret_f1();     // ok: fails
S[] ret_f2();   // should fail
S[1] ret_f4();  // should fail
S[]* ret_f3();  // should fail

void call_f1(S);     // should fail
void call_f1(S[]);   // should fail
void call_f1(S[1]);  // should fail
void call_f1(S[]*);  // should fail

void main() { }
-----

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Steven Schveighoffer <schveiguy@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |schveiguy@yahoo.com


--- Comment #2 from Steven Schveighoffer <schveiguy@yahoo.com> 2014-03-21 15:48:15 PDT ---
I would point out that references to opaque structs should compile.

In your examples:

S[]
S[]*

Should compile, even if S is opaque, as these are just references to S.

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--- Comment #3 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2014-03-21 17:09:08 PDT ---
(In reply to comment #2)
> I would point out that references to opaque structs should compile.
> 
> In your examples:
> 
> S[]
> S[]*
> 
> Should compile, even if S is opaque, as these are just references to S.

Yeah, my mistake.

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