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

Reported by Manu on 20 December 2001.