12. day: 18 bugs were removed (issues 4880, 6592, 8338, 9592, 15312, 15940, 17092, 17121, 17830, 17992, 18287, 18974, 19007, 19010, 19237, 20316, 20349, 20427) Real fixes: Issue 6592 - di header file created even if errors occur Issue 15940 - ImplicitConversionTargets and class alias in struct Issue 20349 - [REG2.087] ICE with sqrt