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Export default module name 'Main' from within TestMain.hs file (#512)
Summary:
**Summary**
**Current**
`stack test` fails with an error "output was redirected with -o, but no output will be generated
because there is no Main module"
**Expected**
`stack test` should run tests to completion
The cause here seems to be that the [`main-is` flag](a88e0669f7/duckling.cabal (L851)
) supplies the *filename* in which to begin tests, but expects to find a *module* named `Main` there by default.
Two possible fixes are possible - either:
- [Add a ghc-options flag](https://github.com/facebook/duckling/issues/505#issue-650474748) to specify a module name; confusingly the flag name is also `main-is`
- Use the default `Main` module name within TestMain.hs
(the approach taken here is the latter, since this avoids duplicating use of flags named `main-is` in slightly different contexts)
**References**
- https://github.com/facebook/duckling/issues/505
- https://github.com/haskell/cabal/issues/4315
**Version Info**
```sh
$ stack --version
1.9.3.1 x86_64
Compiled with:
- Cabal-2.4.0.1
# <remainder of output omitted>
```
Resolves https://github.com/facebook/duckling/issues/505
Pull Request resolved: https://github.com/facebook/duckling/pull/512
Reviewed By: girifb
Differential Revision: D22799888
Pulled By: patapizza
fbshipit-source-id: 2c0808790e6671e6bc3c9b1f322e57b8dc32a8cc
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github/tests/TestMain.hs
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16
github/tests/TestMain.hs
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@ -0,0 +1,16 @@
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-- Copyright (c) 2016-present, Facebook, Inc.
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-- All rights reserved.
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--
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-- This source code is licensed under the BSD-style license found in the
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-- LICENSE file in the root directory of this source tree.
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module Main where
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import Data.String
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import Test.Tasty
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import Duckling.Tests
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import Prelude
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main :: IO ()
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main = defaultMain tests
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