DMD compiles class with undefined interface functions -- resulting in runtime crash

[puneet]

interface intf {
  bool func();
}

abstract class abs: intf
{
  void check( ) {
    import std.stdio: writefln;
    writefln("func: %s -- %s",
        cast(void*) (&func).funcptr,
        cast(void*) (&func).ptr);
    func();            // craches at runtime
  }
}

class ovd: abs { }        // this should not compile

void main() {
  ovd foo = new ovd();
  foo.check();
}

$ dmd --version
DMD64 D Compiler v2.113.0-rc.1
Copyright (C) 1999-2026 by The D Language Foundation, All Rights Reserved written by Walter Bright
$ rdmd --force test.d
func: null -- 7ED881E8B010
Segmentation fault (core dumped)

[itkfm]

class ovd: abs { }        // this should not compile

This looks fine.
What rather worries me is that ovd is not inferred to be abstract or at least the instantiation doesn’t fail:

ovd foo = new ovd();

[tim-dlang]

This was fixed for DMD master in PR #23221, but is not on DMD stable, yet.