AST equality test that ignores NodeInfo

[Bueno, Denis]

Hi all,

Is there a better way than implementing my own equality operator that
explicitly ignores NodeInfo, which is almost all boilerplate and will take a
lot of time?  Is there a way to (ab)use Data.Typeable for this?

If I have an AST for a C file, I would like to be able to read expressions
from another file, to see if any of those expressions match any part of the
AST while I'm traversing the AST.
                              Denis