Bug 15912 – Anonymous class with missing method results in linker error

This code successfully compiles, but fails to link: abstract class A { void x(); } void main() { new class A {}; } The error is: app.o:(.data._D3app4mainFZ13__anonclass516__vtblZ+0x28): undefined reference to `_D3app1A1xMFZv' The error message doesn't mention what causes the error, so it would be nice to detect these problems at compile-time. This might be related to issue 13438.

(In reply to andy.pj.hanson from comment #0) > This code successfully compiles, but fails to link: > > abstract class A { > void x(); > } > > void main() { > new class A {}; > } The same happens with a named class (undefined reference to A.x): ---- abstract class A {void x();} class B : A {} void main() {new B;} ---- This is expected. x is not abstract here. It's supposed to be implemented externally. To make it a compile error, make x abstract: ---- abstract class A { abstract void x(); } void main() { new class A {}; /* Error: cannot create instance of abstract class __anonclass1 */ } ---- Closing as invalid. Feel free to reopen if you think I'm missing something.