ADDITIONAL SYSTEM INFORMATION :
DELL 7720/OpenSUSE Leap 15.1/1.8.0_242

A DESCRIPTION OF THE PROBLEM :
boolean first = true;
...
first = first ? false : (boolean)(() -> false) ;

An exception has occurred in the compiler (1.8.0_242). Please file a bug against the Java compiler via the Java bug reporting page (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com) for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.NullPointerException
at com.sun.tools.javac.code.Types.asSuper(Types.java:1949)
at com.sun.tools.javac.code.Types$4.visitClassType(Types.java:921)
at com.sun.tools.javac.code.Types$4.visitClassType(Types.java:844)
at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:786)
at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4571)
at com.sun.tools.javac.code.Types.isSubtype(Types.java:840)
at com.sun.tools.javac.code.Types.isSubtype(Types.java:804)
at com.sun.tools.javac.code.Types.isCastable(Types.java:1488)
at com.sun.tools.javac.comp.Attr$11.compatible(Attr.java:3114)
at com.sun.tools.javac.comp.Check.checkType(Check.java:546)
at com.sun..................

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
boolean first = true;
...
first = first ? false : (boolean)(() -> false) ;

An exception has occurred in the compiler (1.8.0_242). Please file a bug against the Java compiler via the Java bug reporting page (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com) for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.NullPointerException
at com.sun.tools.javac.code.Types.asSuper(Types.java:1949)
at com.sun.tools.javac.code.Types$4.visitClassType(Types.java:921)
at com.sun.tools.javac.code.Types$4.visitClassType(Types.java:844)
at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:786)
at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4571)
at com.sun.tools.javac.code.Types.isSubtype(Types.java:840)
at com.sun.tools.javac.code.Types.isSubtype(Types.java:804)
at com.sun.tools.javac.code.Types.isCastable(Types.java:1488)
at com.sun.tools.javac.comp.Attr$11.compatible(Attr.java:3114)
at com.sun.tools.javac.comp.Check.checkType(Check.java:546)
at com.sun..................

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Compiler error.
ACTUAL -
An exception has occurred in the compiler (1.8.0_242). Please file a bug against the Java compiler via the Java bug reporting page (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com) for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.NullPointerException
at com.sun.tools.javac.code.Types.asSuper(Types.java:1949)
at com.sun.tools.javac.code.Types$4.visitClassType(Types.java:921)
at com.sun.tools.javac.code.Types$4.visitClassType(Types.java:844)
at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:786)
at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4571)
at com.sun.tools.javac.code.Types.isSubtype(Types.java:840)
at com.sun.tools.javac.code.Types.isSubtype(Types.java:804)
at com.sun.tools.javac.code.Types.isCastable(Types.java:1488)
at com.sun.tools.javac.comp.Attr$11.compatible(Attr.java:3114)
at com.sun.tools.javac.comp.Check.checkType(Check.java:546)
at com.sun..................

---------- BEGIN SOURCE ----------
boolean first = true;
...
first = first ? false : (boolean)(() -> false) ;

---------- END SOURCE ----------

FREQUENCY : always