#14925: Non-ASCII type names get garbled when their `TypeRep` is shown -------------------------------------+------------------------------------- Reporter: | Owner: (none) leftaroundabout | Type: bug | Status: new Priority: low | Milestone: Component: | Version: 8.2.1 libraries/base | Keywords: Typeable | Operating System: Unknown/Multiple TypeRep Unicode ASCII UTF-8 | Architecture: | Type of failure: Incorrect result Unknown/Multiple | at runtime Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- [http://hackage.haskell.org/package/base-4.10.1.0/docs/Data-Typeable.html Typeable] allows easily showing the name of a type by, well, using `show` on it. However, this does not work right for types with Unicode symbols in their name: {{{ GHCi, version 8.2.1: http://www.haskell.org/ghc/ :? for help Prelude> :m +Data.Typeable Prelude Data.Typeable> data W = W Prelude Data.Typeable> typeOf W W Prelude Data.Typeable> data Ω = Ω Prelude Data.Typeable> typeOf Ω Î© }}} This did not yet happen in GHC-7: {{{ GHCi, version 7.10.2: http://www.haskell.org/ghc/ :? for help Prelude> :m +Data.Typeable Prelude Data.Typeable> data W = W Prelude Data.Typeable> typeOf W W Prelude Data.Typeable> data Ω = Ω Prelude Data.Typeable> typeOf Ω Ω }}} N.b.: {{{ Prelude> import Data.ByteString.Char8 as BC8 Prelude BC8> BC8.putStrLn $ pack "Ω" Ω }}} So, this appears to be a UTF-8 problem – something interprets bytestring- stored type-representation names as a different character encoding. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14925 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler