The Template Haskell pretty-printer handles infix/prefix distinction improperly, causing text generated using it to be unparsable. Example: stefan@stefans:~/daanpp$ ghci -fth ___ ___ _ / _ \ /\ /\/ __(_) / /_\// /_/ / / | | GHC Interactive, version 6.7.20070323, for Haskell 98. / /_\\/ __ / /___| | http://www.haskell.org/ghc/ \____/\/ /_/\____/|_| Type :? for help. Loading package base ... linking ... done. Prelude> :m + Language.Haskell.TH Prelude Language.Haskell.TH> runQ [| (+) 2 2 |] >>= print . ppr Loading package template-haskell ... linking ... done. GHC.Num.+ 2 2 I am trying to use the Template Haskell AST system for internal representation of terms in a derivation library that can output Haskell or feed directly into a splice. This "bug", unfixed, would force me to fork the TH pretty printer. What would people think of a patch changing the behavor to "Always produce parsable output"? (Yes, I'm offering to implement it.) Stefan