Compiler Error

[Don Glover]

I have run into yet another problem with an sco compiler.  I am using
2.2.1 compiler to compile some programs in huge model (since the 2.1.4
286 development system had just a few bugs in this area.)  And now I am
getting a 'Compiler Error (Internal) : infinite spill'.  I can not find
this one documented (not that not finding an error undocumented is unusual)
Can some one help me out on.  Why might I be getting this error? 
It happens just 54 lines into the file.
 
Thanx in advance for the help.