#9413: Outputable instance for Unique sometimes generates null bytes -------------------------------------+------------------------------------- Reporter: ezyang | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.9 Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Unknown | Type of failure: Other Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Steps to reproduce: {{{ [ezyang@hs01 ghc-validate]$ inplace/bin/ghc-stage2 --interactive -package ghc GHCi, version 7.9.20140805: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading package array-0.5.0.0 ... linking ... done. Loading package deepseq-1.3.0.2 ... linking ... done. Loading package bytestring-0.10.4.0 ... linking ... done. Loading package containers-0.5.5.1 ... linking ... done. Loading package filepath-1.3.0.2 ... linking ... done. Loading package old-locale-1.0.0.6 ... linking ... done. Loading package time-1.4.2 ... linking ... done. Loading package unix-2.7.0.2 ... linking ... done. Loading package directory-1.2.1.0 ... linking ... done. Loading package pretty-1.1.1.1 ... linking ... done. Loading package process-1.2.0.0 ... linking ... done. Loading package Cabal-1.21.0.0 ... linking ... done. Loading package binary-0.7.1.0 ... linking ... done. Loading package bin-package-db-0.0.0.0 ... linking ... done. Loading package hoopl-3.10.0.1 ... linking ... done. Loading package hpc-0.6.0.1 ... linking ... done. Loading package template-haskell ... linking ... done. Loading package transformers-0.4.1.0 ... linking ... done. Loading package ghc ... linking ... done. Prelude> :m +Unique Prelude Unique> :m +Outputable Prelude Unique Outputable> :m +FastString Prelude Unique Outputable FastString> :m +DynFlags Prelude Unique Outputable FastString DynFlags> showSDoc (defaultDynFlags undefined) $ ppr (getUnique (mkFastString "foo")) "\NUL3bS" }}} We should do something so this doesn't happen. Caused grief due to #9395 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9413 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler