[Issue 21412] New: betterC mode program with C++ interface/class crashes

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21412

          Issue ID: 21412
           Summary: betterC mode program with C++ interface/class crashes
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: mobile at majumdar.org.uk

Following code builds in -betterC mode but crashes.
Tested on RHEL 7.9,  DMD64 D Compiler v2.094.1.

import core.stdc.stdio : printf;

extern (C++) abstract class A {
    void sayHello();
}

extern (C++) class B : A {
        @disable this();
    override void sayHello() {
        printf("hello\n");
    }
}

extern (C) void main() {
    B b;
    b.sayHello();
}

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