$ stack build --verbose
Version 1.9.3, Git revision 40cf7b37526b86d1676da82167ea8758a854953b (6211 commits) x86_64 hpack-0.31.1
2018-12-13 17:27:58.951269: [debug] Checking for project config at: /home/amy/dúmmy/stack.yaml
2018-12-13 17:27:58.951421: [debug] Loading project config file stack.yaml
2018-12-13 17:27:58.952738: [debug] Decoding build plan from: /home/amy/.stack/build-plan/lts-12.22.yaml
2018-12-13 17:27:58.952826: [debug] Trying to decode /home/amy/.stack/build-plan-cache/lts-12.22.cache
2018-12-13 17:27:58.988426: [debug] Success decoding /home/amy/.stack/build-plan-cache/lts-12.22.cache
2018-12-13 17:27:58.989301: [debug] Run process: /sbin/ldconfig -p
2018-12-13 17:27:58.996582: [debug] Process finished in 7ms: /sbin/ldconfig -p
2018-12-13 17:27:58.996956: [debug] Found shared library libtinfo.so.5 in 'ldconfig -p' output
2018-12-13 17:27:58.997052: [debug] Found shared library libtinfo.so.6 in 'ldconfig -p' output
2018-12-13 17:27:58.997340: [debug] Found shared library libncursesw.so.6 in 'ldconfig -p' output
2018-12-13 17:27:58.997569: [debug] Found shared library libgmp.so.10 in 'ldconfig -p' output
2018-12-13 17:27:58.997996: [debug] Did not find shared library libgmp.so.3
2018-12-13 17:27:58.998071: [debug] Potential GHC builds: tinfo6, standard, ncurses6
2018-12-13 17:27:58.998154: [debug] Found already installed GHC builds: tinfo6
2018-12-13 17:27:59.002495: [debug] Getting global package database location
2018-12-13 17:27:59.002604: [debug] Run process: /home/amy/.stack/programs/x86_64-linux/ghc-tinfo6-8.4.4/bin/ghc-pkg --no-user-package-db list --global
2018-12-13 17:27:59.003071: [debug] Getting Cabal package version
2018-12-13 17:27:59.003159: [debug] Run process: /home/amy/.stack/programs/x86_64-linux/ghc-tinfo6-8.4.4/bin/ghc-pkg --no-user-package-db field --simple-output Cabal version
2018-12-13 17:27:59.005320: [debug] Asking GHC for its version
2018-12-13 17:27:59.015417: [debug] Run process: /home/amy/.stack/programs/x86_64-linux/ghc-tinfo6-8.4.4/bin/ghc --numeric-version
2018-12-13 17:27:59.155298: [debug] Process finished in 140ms: /home/amy/.stack/programs/x86_64-linux/ghc-tinfo6-8.4.4/bin/ghc --numeric-version
2018-12-13 17:27:59.155451: [debug] GHC version is: ghc-8.4.4
2018-12-13 17:27:59.186894: [debug] Process finished in 184ms: /home/amy/.stack/programs/x86_64-linux/ghc-tinfo6-8.4.4/bin/ghc-pkg --no-user-package-db list --global
2018-12-13 17:27:59.192363: [debug] Process finished in 189ms: /home/amy/.stack/programs/x86_64-linux/ghc-tinfo6-8.4.4/bin/ghc-pkg --no-user-package-db field --simple-output Cabal version
2018-12-13 17:27:59.192424: [debug] Resolving package entries
2018-12-13 17:27:59.192499: [debug] Trying to decode /home/amy/.stack/loaded-snapshot-cache/x86_64-linux/ghc-8.4.4/lts-12.22.cache
2018-12-13 17:27:59.325189: [debug] Success decoding /home/amy/.stack/loaded-snapshot-cache/x86_64-linux/ghc-8.4.4/lts-12.22.cache
2018-12-13 17:27:59.331666: [debug] Starting to execute command inside EnvConfig
2018-12-13 17:27:59.331809: [debug] Parsing the targets
2018-12-13 17:27:59.331945: [debug] Running hpack on /home/amy/dúmmy/package.yaml
2018-12-13 17:27:59.338550: [debug] hpack output unchanged in /home/amy/dúmmy/dúmmy.cabal
2018-12-13 17:27:59.420623: [debug] Start: getPackageFiles /home/amy/dúmmy/dúmmy.cabal
2018-12-13 17:27:59.424969: [debug] Finished in 4ms: getPackageFiles /home/amy/dúmmy/dúmmy.cabal
2018-12-13 17:27:59.428212: [debug] Finding out which packages are already installed
2018-12-13 17:27:59.439220: [debug] Run process: /home/amy/.stack/programs/x86_64-linux/ghc-tinfo6-8.4.4/bin/ghc-pkg --global --no-user-package-db dump --expand-pkgroot
2018-12-13 17:27:59.581426: [debug] Process finished in 142ms: /home/amy/.stack/programs/x86_64-linux/ghc-tinfo6-8.4.4/bin/ghc-pkg --global --no-user-package-db dump --expand-pkgroot
2018-12-13 17:27:59.582477: [debug] Ignoring package haskeline due to wanting version 0.7.4.3 instead of 0.7.4.2
2018-12-13 17:27:59.583327: [debug] Run process: /home/amy/.stack/programs/x86_64-linux/ghc-tinfo6-8.4.4/bin/ghc-pkg --user --no-user-package-db --package-db /home/amy/.stack/snapshots/x86_64-linux-tinfo6/lts-12.22/8.4.4/pkgdb dump --expand-pkgroot
2018-12-13 17:27:59.652689: [debug] Process finished in 69ms: /home/amy/.stack/programs/x86_64-linux/ghc-tinfo6-8.4.4/bin/ghc-pkg --user --no-user-package-db --package-db /home/amy/.stack/snapshots/x86_64-linux-tinfo6/lts-12.22/8.4.4/pkgdb dump --expand-pkgroot
2018-12-13 17:27:59.652959: [debug] Run process: /home/amy/.stack/programs/x86_64-linux/ghc-tinfo6-8.4.4/bin/ghc-pkg --user --no-user-package-db --package-db /home/amy/dúmmy/.stack-work/install/x86_64-linux-tinfo6/lts-12.22/8.4.4/pkgdb dump --expand-pkgroot
2018-12-13 17:27:59.720874: [debug] Process finished in 68ms: /home/amy/.stack/programs/x86_64-linux/ghc-tinfo6-8.4.4/bin/ghc-pkg --user --no-user-package-db --package-db /home/amy/dúmmy/.stack-work/install/x86_64-linux-tinfo6/lts-12.22/8.4.4/pkgdb dump --expand-pkgroot
2018-12-13 17:27:59.721822: [debug] Constructing the build plan
2018-12-13 17:27:59.722341: [debug] Checking if we are going to build multiple executables with the same name
2018-12-13 17:27:59.722431: [debug] Executing the build plan
2018-12-13 17:27:59.725537: [debug] Getting global package database location
2018-12-13 17:27:59.725632: [debug] Run process: /home/amy/.stack/programs/x86_64-linux/ghc-tinfo6-8.4.4/bin/ghc-pkg --no-user-package-db list --global
2018-12-13 17:27:59.802706: [debug] Process finished in 77ms: /home/amy/.stack/programs/x86_64-linux/ghc-tinfo6-8.4.4/bin/ghc-pkg --no-user-package-db list --global
2018-12-13 17:27:59.803837: [info] Building all executables for `dúmmy' once. After a successful build of all of them, only specified executables will be rebuilt.
2018-12-13 17:27:59.804536: [debug] Encoding /home/amy/dúmmy/.stack-work/dist/x86_64-linux-tinfo6/Cabal-2.2.0.1/stack-build-caches/lib
2018-12-13 17:27:59.807699: [debug] Finished writing /home/amy/dúmmy/.stack-work/dist/x86_64-linux-tinfo6/Cabal-2.2.0.1/stack-build-caches/lib
2018-12-13 17:27:59.807898: [debug] Encoding /home/amy/dúmmy/.stack-work/dist/x86_64-linux-tinfo6/Cabal-2.2.0.1/stack-build-caches/exe-dúmmy-exe
2018-12-13 17:27:59.808155: [debug] Finished writing /home/amy/dúmmy/.stack-work/dist/x86_64-linux-tinfo6/Cabal-2.2.0.1/stack-build-caches/exe-dúmmy-exe
2018-12-13 17:27:59.808285: [info] dúmmy-0.1.0.0: build (lib + exe)
2018-12-13 17:27:59.808479: [debug] Run process within /home/amy/dúmmy/: /home/amy/.stack/setup-exe-cache/x86_64-linux-tinfo6/Cabal-simple_mPHDZzAJ_2.2.0.1_ghc-8.4.4 --builddir=.stack-work/dist/x86_64-linux-tinfo6/Cabal-2.2.0.1 build lib:dúmmy exe:dúmmy-exe --ghc-options " -ddump-hi -ddump-to-file -fdiagnostics-color=always"
2018-12-13 17:27:59.895293: [warn] .stack-work/dist/x86_64-linux-tinfo6/Cabal-2.2.0.1/build/autogen/Paths_dúmmy.hs: hGetContents: invalid argument (invalid byte sequence)
2018-12-13 17:27:59.900795: [debug] Start: getPackageFiles /home/amy/dúmmy/dúmmy.cabal
2018-12-13 17:27:59.911296: [debug] Finished in 6ms: getPackageFiles /home/amy/dúmmy/dúmmy.cabal
2018-12-13 17:27:59.911503: [debug] Encoding /home/amy/dúmmy/.stack-work/dist/x86_64-linux-tinfo6/Cabal-2.2.0.1/stack-build-caches/lib
2018-12-13 17:27:59.911812: [debug] Finished writing /home/amy/dúmmy/.stack-work/dist/x86_64-linux-tinfo6/Cabal-2.2.0.1/stack-build-caches/lib
2018-12-13 17:27:59.911971: [debug] Encoding /home/amy/dúmmy/.stack-work/dist/x86_64-linux-tinfo6/Cabal-2.2.0.1/stack-build-caches/exe-dúmmy-exe
2018-12-13 17:27:59.912219: [debug] Finished writing /home/amy/dúmmy/.stack-work/dist/x86_64-linux-tinfo6/Cabal-2.2.0.1/stack-build-caches/exe-dúmmy-exe

--  While building package d\250mmy-0.1.0.0 using:
      /home/amy/.stack/setup-exe-cache/x86_64-linux-tinfo6/Cabal-simple_mPHDZzAJ_2.2.0.1_ghc-8.4.4 --builddir=.stack-work/dist/x86_64-linux-tinfo6/Cabal-2.2.0.1 build lib:dúmmy exe:dúmmy-exe --ghc-options " -ddump-hi -ddump-to-file -fdiagnostics-color=always"
    Process exited with code: ExitFailure 1