Following instructions from https://www.haskell.org/pipermail/haskell-cafe/2014-October/116469.html and https://gist.github.com/adinapoli/d4c33a9d1ea85bcaebdf

1.to_reproduce.txt

∴ cd /tmp/
∴ mkdir testing-hashtables
∴ cd testing-hashtables/
∴ cabal sandbox init
Writing a default package environment file to
/private/tmp/testing-hashtables/cabal.sandbox.config
Creating a new sandbox at /private/tmp/testing-hashtables/.cabal-sandbox
∴ cabal install hashtables
Resolving dependencies...
Notice: installing into a sandbox located at
/private/tmp/testing-hashtables/.cabal-sandbox
Configuring primitive-0.5.4.0...
Configuring text-1.2.0.2...
Building text-1.2.0.2...
Building primitive-0.5.4.0...
Installed primitive-0.5.4.0
Configuring vector-0.10.12.2...
Building vector-0.10.12.2...
Installed vector-0.10.12.2
Installed text-1.2.0.2
Configuring hashable-1.2.2.0...
Building hashable-1.2.2.0...
Installed hashable-1.2.2.0
Configuring hashtables-1.2.0.0...
Building hashtables-1.2.0.0...
Installed hashtables-1.2.0.0
∴ cabal exec -- ghc -v PlayingWithHashtables.hs
Glasgow Haskell Compiler, Version 7.8.3, stage 2 booted by GHC version 7.8.3
Using binary package database: /usr/local/Cellar/ghc/7.8.3/lib/ghc-7.8.3/package.conf.d/package.cache
Using binary package database: /private/tmp/testing-hashtables/.cabal-sandbox/x86_64-osx-ghc-7.8.3-packages.conf.d/package.cache
wired-in package ghc-prim mapped to ghc-prim-0.3.1.0-954cb57749cf319beafdc89b3415422c
wired-in package integer-gmp mapped to integer-gmp-0.5.1.0-d42e6a7874a019e6a0d1c7305ebc83c4
wired-in package base mapped to base-4.7.0.1-c64d224738ec7af4085e89ca9c12c37b
wired-in package rts mapped to builtin_rts
wired-in package template-haskell mapped to template-haskell-2.9.0.0-310613e57f38a482326cc4ba2989009e
wired-in package dph-seq not found.
wired-in package dph-par not found.
Hsc static flags:
wired-in package ghc-prim mapped to ghc-prim-0.3.1.0-954cb57749cf319beafdc89b3415422c
wired-in package integer-gmp mapped to integer-gmp-0.5.1.0-d42e6a7874a019e6a0d1c7305ebc83c4
wired-in package base mapped to base-4.7.0.1-c64d224738ec7af4085e89ca9c12c37b
wired-in package rts mapped to builtin_rts
wired-in package template-haskell mapped to template-haskell-2.9.0.0-310613e57f38a482326cc4ba2989009e
wired-in package dph-seq not found.
wired-in package dph-par not found.
*** Chasing dependencies:
Chasing modules from: *PlayingWithHashtables.hs
Stable obj: [Main]
Stable BCO: []
Ready for upsweep
  [NONREC
      ModSummary {
         ms_hs_date = 2014-12-12 01:27:02 UTC
         ms_mod = main:Main,
         ms_textual_imps = [import (implicit) Prelude,
                            import qualified Data.HashTable.ST.Basic as B,
                            import qualified Data.HashTable.IO as H]
         ms_srcimps = []
      }]
*** Deleting temp files:
Deleting:
compile: input file PlayingWithHashtables.hs
Created temporary directory: /var/folders/6z/dh8wd6f13f7b97zwsskd2f500000gn/T/ghc39965_0
*** Checking old interface for main:Main:
[1 of 1] Skipping  Main             ( PlayingWithHashtables.hs, PlayingWithHashtables.o )
Upsweep completely successful.
*** Deleting temp files:
Deleting: /var/folders/6z/dh8wd6f13f7b97zwsskd2f500000gn/T/ghc39965_0/ghc39965_1.s
Warning: deleting non-existent /var/folders/6z/dh8wd6f13f7b97zwsskd2f500000gn/T/ghc39965_0/ghc39965_1.s
link: linkables are ...
LinkableM (2014-12-12 01:27:20 UTC) main:Main
   [DotO PlayingWithHashtables.o]
Linking PlayingWithHashtables ...
*** C Compiler:
clang -B/usr/local/lib -m64 -fno-stack-protector -DTABLES_NEXT_TO_CODE -c /var/folders/6z/dh8wd6f13f7b97zwsskd2f500000gn/T/ghc39965_0/ghc39965_2.c -o /var/folders/6z/dh8wd6f13f7b97zwsskd2f500000gn/T/ghc39965_0/ghc39965_3.o -I/usr/local/Cellar/ghc/7.8.3/lib/ghc-7.8.3/include
*** Linker:
clang -B/usr/local/lib -m64 -fno-stack-protector -DTABLES_NEXT_TO_CODE -L/usr/local/lib -m64 -o PlayingWithHashtables -Wl,-no_compact_unwind PlayingWithHashtables.o -L/private/tmp/testing-hashtables/.cabal-sandbox/lib/x86_64-osx-ghc-7.8.3/hashtables-1.2.0.0 -L/private/tmp/testing-hashtables/.cabal-sandbox/lib/x86_64-osx-ghc-7.8.3/vector-0.10.12.2 -L/private/tmp/testing-hashtables/.cabal-sandbox/lib/x86_64-osx-ghc-7.8.3/primitive-0.5.4.0 -L/private/tmp/testing-hashtables/.cabal-sandbox/lib/x86_64-osx-ghc-7.8.3/hashable-1.2.2.0 -L/private/tmp/testing-hashtables/.cabal-sandbox/lib/x86_64-osx-ghc-7.8.3/text-1.2.0.2 -L/usr/local/Cellar/ghc/7.8.3/lib/ghc-7.8.3/bytestring-0.10.4.0 -L/usr/local/Cellar/ghc/7.8.3/lib/ghc-7.8.3/deepseq-1.3.0.2 -L/usr/local/Cellar/ghc/7.8.3/lib/ghc-7.8.3/array-0.5.0.0 -L/usr/local/Cellar/ghc/7.8.3/lib/ghc-7.8.3/base-4.7.0.1 -L/usr/local/Cellar/ghc/7.8.3/lib/ghc-7.8.3/integer-gmp-0.5.1.0 -L/usr/local/Cellar/ghc/7.8.3/lib/ghc-7.8.3/ghc-prim-0.3.1.0 -L/usr/local/Cellar/ghc/7.8.3/lib/ghc-7.8.3/rts-1.0 /var/folders/6z/dh8wd6f13f7b97zwsskd2f500000gn/T/ghc39965_0/ghc39965_3.o -Wl,-u,_ghczmprim_GHCziTypes_Izh_static_info -Wl,-u,_ghczmprim_GHCziTypes_Czh_static_info -Wl,-u,_ghczmprim_GHCziTypes_Fzh_static_info -Wl,-u,_ghczmprim_GHCziTypes_Dzh_static_info -Wl,-u,_base_GHCziPtr_Ptr_static_info -Wl,-u,_ghczmprim_GHCziTypes_Wzh_static_info -Wl,-u,_base_GHCziInt_I8zh_static_info -Wl,-u,_base_GHCziInt_I16zh_static_info -Wl,-u,_base_GHCziInt_I32zh_static_info -Wl,-u,_base_GHCziInt_I64zh_static_info -Wl,-u,_base_GHCziWord_W8zh_static_info -Wl,-u,_base_GHCziWord_W16zh_static_info -Wl,-u,_base_GHCziWord_W32zh_static_info -Wl,-u,_base_GHCziWord_W64zh_static_info -Wl,-u,_base_GHCziStable_StablePtr_static_info -Wl,-u,_ghczmprim_GHCziTypes_Izh_con_info -Wl,-u,_ghczmprim_GHCziTypes_Czh_con_info -Wl,-u,_ghczmprim_GHCziTypes_Fzh_con_info -Wl,-u,_ghczmprim_GHCziTypes_Dzh_con_info -Wl,-u,_base_GHCziPtr_Ptr_con_info -Wl,-u,_base_GHCziPtr_FunPtr_con_info -Wl,-u,_base_GHCziStable_StablePtr_con_info -Wl,-u,_ghczmprim_GHCziTypes_False_closure -Wl,-u,_ghczmprim_GHCziTypes_True_closure -Wl,-u,_base_GHCziPack_unpackCString_closure -Wl,-u,_base_GHCziIOziException_stackOverflow_closure -Wl,-u,_base_GHCziIOziException_heapOverflow_closure -Wl,-u,_base_ControlziExceptionziBase_nonTermination_closure -Wl,-u,_base_GHCziIOziException_blockedIndefinitelyOnMVar_closure -Wl,-u,_base_GHCziIOziException_blockedIndefinitelyOnSTM_closure -Wl,-u,_base_ControlziExceptionziBase_nestedAtomically_closure -Wl,-u,_base_GHCziWeak_runFinalizzerBatch_closure -Wl,-u,_base_GHCziTopHandler_flushStdHandles_closure -Wl,-u,_base_GHCziTopHandler_runIO_closure -Wl,-u,_base_GHCziTopHandler_runNonIO_closure -Wl,-u,_base_GHCziConcziIO_ensureIOManagerIsRunning_closure -Wl,-u,_base_GHCziConcziIO_ioManagerCapabilitiesChanged_closure -Wl,-u,_base_GHCziConcziSync_runSparks_closure -Wl,-u,_base_GHCziConcziSignal_runHandlers_closure -Wl,-search_paths_first -lHShashtables-1.2.0.0 -lHSvector-0.10.12.2 -lHSprimitive-0.5.4.0 -lHShashable-1.2.2.0 -lHStext-1.2.0.2 -lHSbytestring-0.10.4.0 -lHSdeepseq-1.3.0.2 -lHSarray-0.5.0.0 -lHSbase-4.7.0.1 -lHSinteger-gmp-0.5.1.0 -lHSghc-prim-0.3.1.0 -lHSrts -lCffi -liconv -lgmp -lm -ldl
Undefined symbols for architecture x86_64:
  "_line_mask", referenced from:
      _line_search in libHShashtables-1.2.0.0.a(default.o)
  "_line_mask_2", referenced from:
      _line_search_2 in libHShashtables-1.2.0.0.a(default.o)
  "_line_mask_3", referenced from:
      _line_search_3 in libHShashtables-1.2.0.0.a(default.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
*** Deleting temp files:
Deleting: /var/folders/6z/dh8wd6f13f7b97zwsskd2f500000gn/T/ghc39965_0/ghc39965_3.o /var/folders/6z/dh8wd6f13f7b97zwsskd2f500000gn/T/ghc39965_0/ghc39965_2.c
*** Deleting temp dirs:
Deleting: /var/folders/6z/dh8wd6f13f7b97zwsskd2f500000gn/T/ghc39965_0

PlayingWithHashtables.hs

module Main where

import qualified Data.HashTable.IO as H
import qualified Data.HashTable.ST.Basic as B
type BasicHashTable k v = H.IOHashTable (B.HashTable)  k v

foo :: IO (BasicHashTable Int Int)
foo = do
    ht <- H.new
    H.insert ht 1 1
    return ht

main = do
  hash <- foo
  output <- H.lookup hash 1
  print output