Bug 16951 – trying to call opCall with alias opCall this, without parentesis fails to compile, when used as a single statement

struct A { alias opCall this; int opCall() { return 0; } } void main() { A a; // a; // Error: var has no effect in expression (a) // some working examples but with some issues auto a1 = a; // calls copy constructor int a2 = a; // calls opCall a.writeln; // toString a.someIntFun; // opCall } those issues can be partialy solved by adding @property to opCall struct A { alias opCall this; @property int opCall() { return 0; } } void main() { A a; // a; // still Error: var has no effect in expression (a) auto a1 = a; // copy constructor int a2 = a; // opCall a.writeln; // opCall a.someIntFun; // opCall } dont know if its a bug or not but would be nice if the commented line would compile.

Addressed by https://wiki.dlang.org/DIP23