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Stack 2.1.1 fails to build package with non-ascii module name #4938

bjornbm opened this issue Jul 4, 2019 · 1 comment


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commented Jul 4, 2019

General summary/comments (optional)

Stack 2.1.1 fails to build when module names contain ä. Stack 1.9.3 does NOT fail.

Steps to reproduce

  1. Clone
  2. stack build --verbose


A successful build.


The build fails with (last lines of output, for full output see gist):

2019-07-04 22:13:21.591710: [info] Linking .stack-work/dist/x86_64-osx/Cabal- ...
2019-07-04 22:13:23.467465: [debug] Process finished in 4757ms: /Users/bjorn/.stack/setup-exe-cache/x86_64-osx/Cabal-simple_mPHDZzAJ_2.4.0.1_ghc-8.6.5 --builddir=.stack-work/dist/x86_64-osx/Cabal- build lib:umlaut exe:umlaut-exe --ghc-options ""
2019-07-04 22:13:23.468057: [debug] Start: getPackageFiles /Users/bjorn/repos/umlaut/umlaut.cabal
2019-07-04 22:13:23.470598: [debug] Finished with exception in 2ms: getPackageFiles /Users/bjorn/repos/umlaut/umlaut.cabal
Exception thrown: ModuleName.fromComponents: invalid components ["T\195\164st"]
CallStack (from HasCallStack):
  error, called at ./Distribution/ModuleName.hs:105:46 in Cabal-
2019-07-04 22:13:23.473932: [error] ModuleName.fromComponents: invalid components ["T\195\164st"]
CallStack (from HasCallStack):
  error, called at ./Distribution/ModuleName.hs:105:46 in Cabal-

The error is reported by a cabal function ModuleName.fromComponents, but since the says that Cabal 2.4 has been used since stack-1.9.1 I assume there is a change in how stack passes the module names to cabal.

May be related to UTF normalisation? (ore the absence thereof?)

Interestingly if the Täst module is imported by Main.hs instead of Lib.hs the build completes just fine (see branch named "works").

Stack version

$ stack --version
Version 2.1.1, Git revision f612ea85316bbc327a64e4ad8d9f0b150dc12d4b (7648 commits) x86_64 hpack-0.31.2

Method of installation

stack upgrade --force-download


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commented Jul 4, 2019

Thanks for the report! According to my quick investigation it looks like some incorrect module name handling was introduced in #4804

@qrilka qrilka referenced this issue Jul 6, 2019


Fix support for non-ASCII module names #4939

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