This compiles with no errors with dmd 2.047:

class Foo {
    abstract void bar();
}
void main() {}


But in my opinion dmd has to require code like this, where Foo too has 'abstract' (I think LDC compiler does the same):

abstract class Foo {
    abstract void bar();
}
void main() {}


See also bug 3934

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This is instead OK, because according to D syntax all Foo methods are meant to be abstract:

abstract class Foo {
    void bar();
}
void main() {}