question: protected Set < FIsA > createInitialAssignmentConstraints ( final AnnotatedTypeMirror assignedTo , final AnnotatedTypeMirror boxedReturnType , final AnnotatedTypeFactory typeFactory , final Set < TypeVariable > targets ) { final Set < FIsA > result = new LinkedHashSet < > ( ) ; if ( assignedTo != null ) { final Set < AFConstraint > reducedConstraints = new LinkedHashSet < > ( ) ; final Queue < AFConstraint > constraints = new LinkedList < > ( ) ; constraints . add ( new F2A ( boxedReturnType , assignedTo ) ) ; reduceAfConstraints ( typeFactory , reducedConstraints , constraints , targets ) ; for ( final AFConstraint reducedConstraint : reducedConstraints ) { if ( reducedConstraint instanceof FIsA ) { result . add ( ( FIsA ) reducedConstraint ) ; } } } return result ; }
target:  Create a set of constraints between return type and any type to which it is assigned.  Reduce these set of constraints and remove any that is not an equality (FIsA) constraint.