A generic class `C [G]' has a function `f (i: like item): LIST [C
[G]]' and also has a feature `item: G'.  A descendant class redefines
the function so that its signature is `f (i: like item): LIST [C [like
item]]' and it calls Precursor.  The compiler dies in degree 3 when
compiling the system.

Reported by Manu on 26 December 2001.