Hi all Hopefully I will be able to stop harassing everyone on this topic soon. The final versions of the patches for this are ready for review. It has been split into three parts D412 Extends the HsLit values to have an extra field for the original source text, which can differ from the literal value. D426 adds various extra locations in the HsSyn AST to allow the additions of API annotations everywhere needed. D438 modifies the Lexer/Parser to produce API annotations and comments as part of the ParsedSource result. Please review if you are interested. Links https://ghc.haskell.org/trac/ghc/wiki/GhcAstAnnotations https://ghc.haskell.org/trac/ghc/ticket/9628 https://phabricator.haskell.org/D412 https://phabricator.haskell.org/D426 https://phabricator.haskell.org/D438 Regards Alan