A small code improvement: rather thah doing a dynamic_cast to check if an expr 
is an fo_expr, use the get_expr_kind() method. So, the code would look like 

if (right->get_expr_kind() == fo_expr_kind)
  fo_expr* lfoExpr = static_cast<fo_expr*>(right.getp());

Also, please respect the coding style of the files you update. In this case, 
put the "{" in a separate line.

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