Confusing error message when loading package with TH
I got this error message when compiling a file that calls Template Haskell function from singletons package:
[1 of 1] Compiling Splices ( Splices.hs, Splices.o )
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package transformers-0.3.0.0 ... linking ... done.
Loading package pretty-1.1.1.1 ... linking ... done.
Loading package array-0.5.0.0 ... linking ... done.
Loading package deepseq-1.3.0.2 ... linking ... done.
Loading package containers-0.5.5.1 ... linking ... done.
Loading package mtl-2.1.2 ... linking ... done.
Loading package template-haskell ... linking ... done.
Loading package syb-0.4.1 ... linking ... done.
Loading package th-desugar-1.4.0 ... linking ... done.
Loading package singletons-1.0 ... <command line>: can't load .so/.DLL for: /home/killy/.cabal/lib/x86_64-linux-ghc-7.8.2/singletons-1.0/libHSsingletons-1.0-ghc7.8.2.so (/home/killy/.cabal/lib/x86_64-linux-ghc-7.8.2/singletons-1.0/libHSsingletons-1.0-ghc7.8.2.so: undefined symbol: singletonszm1zi0_DataziSingletonsziSingleziMonad_lookupProxy1_info)After some investigation it turned out that the module Data.Singletons.Single.Monad was not listed in singletons.cabal file - neither under exported-modules nor other-modules - when the package was installed. The error message is mostly confusing. It would be good to at least get a hint on the possible cause.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.8.2 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Package system |
| Test case | |
| Differential revisions | |
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| Related | |
| Blocking | |
| CC | |
| Operating system | |
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