Hi all, I have a program able to read another program as a string, and interpret it (using Hint). I'd like to make unit tests, so I have a file "Test.hs" containing a serie of test programs as strings. However, how could I be sure that these test program are syntactically valid, at compile time? Those programs should have the type "RuleFunc". I tried some TH: printProg :: Q Exp -> String printProg p = unsafePerformIO $ do expr <- runQ p return $ pprint expr myTest = printProg [| <my test program> :: RuleFunc |] But it's not very satisfatory yet. When pretty printing TH changes the program quite a bit and my interpreter cannot compile it due to scoping problems. I'd like to have my test program copied back as is. Is it possible? Any other solutions? Thanks a lot! Corentin