Before: call ale#assert#SetUpLinterTest('haskell', 'cabal_ghc') After: call ale#assert#TearDownLinterTest() Execute(The options should be used in the command): AssertLinterCwd '%s:h' AssertLinter 'cabal', 'cabal exec -- ghc -fno-code -v0 %t' let b:ale_haskell_cabal_ghc_options = 'foobar' AssertLinter 'cabal', 'cabal exec -- ghc foobar %t'