https://issues.dlang.org/show_bug.cgi?id=20406

          Issue ID: 20406
           Summary: Copy constructor requires default constructor
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: Bastiaan@Veelo.net

```
struct S
{
        @disable this();
        this(int) {}
        this(ref S other) {}
}

void foo(S s) {}

S s = S(3);
foo(s);
```

Fails compilation with a message like "Error: variable `onlineapp.main.__copytmp112` default construction is disabled for type `S`"

Either removing the copy constructor or enabling the default constructor makes this work.

Note that this seems to be only an issue for parameter passing, explicit initializations still work fine for the above definition of S:

S s2 = s;

--