https://issues.dlang.org/show_bug.cgi?id=17059
--- Comment #3 from [email protected] --- Commits pushed to stable at https://github.com/dlang/dmd https://github.com/dlang/dmd/commit/c4ac1abed6e6aa95b1312d777f77fb634e2dac07 fix Issue 17059 - incorrect circular reference with `is(Klass : Interface)` - fixed by tweaking the fix for Issue 16980 (#6383) - happened b/c TypeClass::implicitConv -> TypeClass::constConv checks for offset == 0, which triggered size finalization - instead handle unfinalized classes in isBaseOf (new OFFSET_FWDREF) and only explicity finalize size before optimizing casts - add a halt for any OFFSET_FWDREF leaking through to IR gen https://github.com/dlang/dmd/commit/45c886fab62ed8a99ab054d3d5e9c2e6a38e429e Merge pull request #6412 from MartinNowak/fix17059 fix Issue 17059 - incorrect circular reference with `is(Klass : Interface)` --
