%% Classes ---------------------------------------------------------------

a < b

b

c

d < (a, b)

e < f

f

g < h

h

%% Diagnostics -----------------------------------------------------------

Warning (line 2, column 11) implicit declaration of superclass 'b'

Warning (line 3, column 7) redeclared class 'b'

Warning (line 4, column 11) redundant universe class

Warning (line 6, column 7) redeclared class 'd'

Warning (line 6, column 11) already known as super class 'b'

Warning (line 7, column 7) redeclared class 'd'

Warning (line 7, column 11) already known as super class 'a'

Warning (line 8, column 18) implicit declaration of superclass 'f'

Warning (line 9, column 12) implicit declaration of superclass 'h'