master..f84e051 · typeable/generic-arbitrary

.github/workflows/haskell-ci.ymldeleted−29

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1−name: Haskell-CI

2−on: [push, pull_request]

3−jobs:

4− linux:

5− name: GHC-${{ matrix.ghc-version }}

6− runs-on: ubuntu-latest

7− strategy:

8− matrix:

9− ghc-version:

10− - 8.6.5

11− - 8.10.7

12− - 9.0.2

13− - 9.2.4

14− - 9.4.3

15− - 9.8.1

16− steps:

17− - uses: actions/checkout@v3

18− - uses: haskell/actions/setup@v2

19− with:

20− enable-stack: true

21− ghc-version: ${{ matrix.ghc-version }}

22− stack-version: 'latest'

23− - uses: actions/cache@v3

24− with:

25− path: |

26− ~/.stack

27− ./.stack-work

28− key: ${{ matrix.ghc-version }}

29− - run: stack --stack-yaml ghc-${{ matrix.ghc-version }}.yaml --install-ghc test --fast --haddock

.gitignore−1

@@ -4,4 +4,3 @@ dist

44.cabal-sandbox/

55cabal.sandbox.config

66dist-newstyle

7−TAGS

CHANGELOG.md−16

@@ -1,19 +1,3 @@

1−1.0.1.2

2−-------

3−

4−* Fix dependency bounds (including retroactively), and compilation with warnings.

5−

6−1.0.1.1

7−-------

8−

9−* Fix compilation with GHC 9.8.3

10−

11−1.0.1

12−-----

13−

14−* Compillability by GHC-9.2.4

15−* Fix cabal `tested-with` field

16−

1711.0.0

182-----

193

README.md+12−114

@@ -1,31 +1,14 @@

11# generic-arbitrary

22

3−[![Haskell-CI](https://github.com/typeable/generic-arbitrary/actions/workflows/haskell-ci.yml/badge.svg)](https://github.com/typeable/generic-arbitrary/actions/workflows/haskell-ci.yml)

3+[![Build Status](https://travis-ci.org/typeable/generic-arbitrary.svg?branch=master)](https://travis-ci.org/typeable/generic-arbitrary)

44

5−# What?

6−

7−Package for deriving `Arbitrary` via `Generic`.

5+Deriving `Arbitrary` via `Generic`.

86

97``` haskell

108import GHC.Generics (Generic)

119import Test.QuickCheck

1210import Test.QuickCheck.Arbitrary.Generic

1311

14−data Expr

15− = Lit Int

16− | Add Expr Expr

17− | Mul Expr Expr

18− deriving (Eq, Show, Generic)

19− deriving Arbitrary via (GenericArbitrary Expr)

20−```

21−

22−Older versions of this package had a problem with hanging `arbitrary`

23−method. Since `1.0.0` this problem almost solved.

24−

25−For `QuickCheck` older than `2.14.0` the `GenericArbitrary` is not available, so

26−you will need to write instances more verbosely

27−

28−``` haskell

2912data Expr

3013 = Lit Int

3114 | Add Expr Expr

@@ -37,104 +20,19 @@ instance Arbitrary Expr where

3720 shrink = genericShrink

3821```

3922

40−Which is generally the same.

41−

42−# Infinite terms problem

43−

44−The `generic-arbitrary` can partially handle the problem with recursive

45−types. Assume the type `R`

46−

47−``` haskell

48−data R = R R

49− deriving Generic

50−```

51−

52−there is no instance

53−

54−``` haskell

55−instance Arbitrary R where

56− arbitrary = genericArbitrary

57− shrink = genericShrink

58−```

59−

60−If you try to compile this you will get a type level error

61−

62−> • R refers to itself in all constructors

63−

64−Which means that there is no finite term for `R` because it is recursive in all

65−it's constructors. But, if you correct the definition of `R` like this.

66−

67−``` haskell

68−data R = R R | F

69− deriving Generic

70−```

71−

72−Then it will compile. And the `arbitrary` generated will not hang forever,

73−because it respects the `size` parameter.

74−

75−## Limitation

76−

77−There is a limitation of recursion detection:

23+if type has an argument then `Arg` is required

7824

7925``` haskell

80−data R1 = R1 R2

81− deriving (Eq, Ord, Show, Generic)

82− deriving anyclass NFData

83− deriving Arbitrary via (GenericArbitrary R1)

84−

85−data R2 = R2 R1

86− deriving (Eq, Ord, Show, Generic)

87− deriving anyclass NFData

88− deriving Arbitrary via (GenericArbitrary R2)

89−```

90−

91−This code will compile and the `arbitrary` generated will always hang. Yes,

92−there is a problem with mutually recursive types.

93−

94−# Type parameters

95−

96−Now let's see an example of datatype with parameters

97−

98−``` haskell

99−data A a = A a

100− deriving (Eq, Ord, Show)

101− deriving anyclass NFData

102− deriving (Generic)

103−

104−instance (Arbitrary a) => Arbitrary (A a) where

105− arbitrary = genericArbitrary

106− shrink = genericShrink

107−```

108−

109−It should work from first glance, but when compile it will throw an error:

110−

111−```

112−• Could not deduce (Test.QuickCheck.Arbitrary.Generic.GArbitrary

113− (A a)

114− (GHC.Generics.D1

115− ('GHC.Generics.MetaData "A" "ParametersTest" "main" 'False)

116− (GHC.Generics.C1

117− ('GHC.Generics.MetaCons "A" 'GHC.Generics.PrefixI 'False)

118− (GHC.Generics.S1

119− ('GHC.Generics.MetaSel

120− 'Nothing

121− 'GHC.Generics.NoSourceUnpackedness

122− 'GHC.Generics.NoSourceStrictness

123− 'GHC.Generics.DecidedLazy)

124− (GHC.Generics.Rec0 a))))

125− (TypesDiffer (A a) a))

126− arising from a use of ‘genericArbitrary’

127−```

128−

129−Here the `TypesDiffer` is a type familty dealing with recursive types and

130−helping us to eliminate inproper instances. To convince the compiller, that the

131−`a` parameter is not an `A a` we must fix the instance with additional

132−constraint `Arg (A a) a`

26+data Expr lit

27+ = Lit lit

28+ | Add Expr Expr

29+ | Mul Expr Expr

30+ deriving (Eq, Show, Generic)

13331

134−``` haskell

135−instance (Arg (A a) a, Arbitrary a) => Arbitrary (A a) where

32+instance

33+ ( Arbitrary lit

34+ , Arg (Expr lit) lit

35+ ) => Arbitrary (Expr lit) where

13636 arbitrary = genericArbitrary

13737 shrink = genericShrink

13838```

139−

140−Now everything compiles and works as expected.

generic-arbitrary.cabal+19−25

@@ -1,10 +1,10 @@

11name: generic-arbitrary

2−version: 1.0.1.2

2+version: 1.0.0

33synopsis: Generic implementation for QuickCheck's Arbitrary

44description:

55 Generic implementations of methods of the 'Arbitrary' class from the

66 QuickCheck library. The approach taken here can lead to diverging instances

7− for mutually recursive types but is safe for simply recursive ones and guarantees

7+ for recursive types but is safe for non-recursive ones and guarantees

88 flat distribution for constructors of sum-types.

99

1010license: MIT

@@ -15,14 +15,14 @@ homepage: http://github.com/typeable/generic-arbitrary#readme

1515category: Generic

1616build-type: Simple

1717extra-source-files: CHANGELOG.md

18− , README.md

19−cabal-version: 2.0

20−tested-with: GHC == 8.6.5

21− , GHC == 8.10.7

22− , GHC == 9.0.2

23− , GHC == 9.2.4

24− , GHC == 9.4.3

25− , GHC == 9.8.1

18+cabal-version: 1.22

19+tested-with: GHC == 7.10.3

20+ , GHC == 8.0.2

21+ , GHC == 8.2.2

22+ , GHC == 8.4.1

23+ , GHC == 8.6.5

24+ , GHC == 8.10.1

25+ , GHC == 9.0.2

2626

2727source-repository head

2828 type: git

@@ -31,7 +31,7 @@ source-repository head

3131library

3232 exposed-modules: Test.QuickCheck.Arbitrary.Generic

3333 build-depends: base >=4.8 && <5

34− , QuickCheck >=2.8

34+ , QuickCheck >= 2.14

3535 hs-source-dirs: src

3636 default-language: Haskell2010

3737 default-extensions: AllowAmbiguousTypes

@@ -59,27 +59,21 @@ test-suite test

5959 hs-source-dirs: test

6060 main-is: Test.hs

6161 default-language: Haskell2010

62− build-depends: base >=4.12 && <5

63− , QuickCheck >=2.10

62+ build-depends: base >= 4.8 && <5

63+ , QuickCheck

6464 , deepseq

6565 , generic-arbitrary

66− , tasty >=1.4.2 || <1.4.0.1

67− , tasty-discover >= 2.0.0

68− , tasty-hunit >= 0.9.2

66+ , tasty

67+ , tasty-discover

68+ , tasty-hunit

6969 , tasty-quickcheck

70− other-modules: Auxiliary

71− , EnumTest

72− , LimitationDemo

70+ other-modules: LimitationDemo

7371 , NoTypecheckTest

74− , ParametersTest

7572 , RecursiveTest

7673 default-extensions: AllowAmbiguousTypes

7774 , CPP

7875 , DataKinds

79− , DeriveAnyClass

8076 , DeriveGeneric

81− , DerivingStrategies

82− , DerivingVia

8377 , FlexibleContexts

8478 , FlexibleInstances

8579 , GeneralizedNewtypeDeriving

@@ -88,14 +82,14 @@ test-suite test

8882 , PolyKinds

8983 , RankNTypes

9084 , ScopedTypeVariables

91− , TypeApplications

9285 , TypeFamilies

9386 , TypeOperators

9487 , TypeSynonymInstances

9588 , UndecidableInstances

9689 , ViewPatterns

97− build-tool-depends: tasty-discover:tasty-discover

90+ build-tools: tasty-discover

9891 ghc-options: -Wall

9992 -threaded

10093 -rtsopts

10194 "-with-rtsopts=-N -A64m -qb0 -n4m -T -I1"

95+ default-extensions: DeriveGeneric

ghc-8.10.7.yamldeleted−1

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src/Test/QuickCheck/Arbitrary/Generic.hs+10−155

@@ -1,14 +1,8 @@

1−#if __GLASGOW_HASKELL__ >= 806

2−{-# OPTIONS_GHC -Wno-star-is-type #-}

3−#endif

4−#if __GLASGOW_HASKELL__ >= 800

5−{-# OPTIONS_GHC -Wno-unticked-promoted-constructors #-}

6−#endif

1+{-# LANGUAGE FlexibleContexts, UndecidableInstances, TypeOperators, DataKinds, TypeFamilies, ScopedTypeVariables#-}

72

8−{-|

3+{- |

94

10−This module is a generic implementation of the 'arbitrary' method. Example

11−usage:

5+Generic implementation of the 'arbitrary' method. Example usage:

126

137@

148data Foo = Foo

@@ -33,151 +27,27 @@ data Foo = Foo

3327

3428The generated 'arbitrary' method is equivalent to

3529

36−@

37−Foo '<$>' arbitrary '<*>' arbitrary

38−@.

39−

40−It can also handle a recursive types problem. Assuming a type

41−

42−@

43−data R = R R

44− deriving Generic

45−@

46−

47−there is no instance

48−

49−@

50−instance Arbitrary R where

51− arbitrary = genericArbitrary

52− shrink = genericShrink

53−@

54−

55−If you try to compile this you will get a type level error

56−

57−> • R refers to itself in all constructors

58−

59−Which means that there is no finite term for @R@ because it is recursive. But,

60−if you correct the definition of @R@ like this.

61−

62−@

63−data R = R R | F

64− deriving Generic

65−@

66−

67−Then it will compile. And the @arbitrary@ generated will not hang forever, because

68−it respects the @size@ parameter.

69−

70−There is a limitation of recursion detection:

71−

72−@

73−data R1 = R1 R2

74− deriving (Eq, Ord, Show, Generic)

75− deriving anyclass NFData

76− deriving Arbitrary via (GenericArbitrary R1)

77−

78−data R2 = R2 R1

79− deriving (Eq, Ord, Show, Generic)

80− deriving anyclass NFData

81− deriving Arbitrary via (GenericArbitrary R2)

82−@

83−

84−This code will compile and the @arbitrary@ generated will always hang. Yes,

85−there is a problem with mutually recursive types.

86−

87−Now lets see an example of datatype with parameters

88−

89−@

90−data A a = A a

91− deriving (Eq, Ord, Show)

92− deriving anyclass NFData

93− deriving (Generic)

94−

95−instance (Arbitrary a) => Arbitrary (A a) where

96− arbitrary = genericArbitrary

97− shrink = genericShrink

98−@

99−

100−It should work from first glance, but when compile it will throw an error:

101−

102−@

103− • Could not deduce (Test.QuickCheck.Arbitrary.Generic.GArbitrary

104− (A a)

105− (GHC.Generics.D1

106− ('GHC.Generics.MetaData "A" "ParametersTest" "main" 'False)

107− (GHC.Generics.C1

108− ('GHC.Generics.MetaCons "A" 'GHC.Generics.PrefixI 'False)

109− (GHC.Generics.S1

110− ('GHC.Generics.MetaSel

111− 'Nothing

112− 'GHC.Generics.NoSourceUnpackedness

113− 'GHC.Generics.NoSourceStrictness

114− 'GHC.Generics.DecidedLazy)

115− (GHC.Generics.Rec0 a))))

116− (TypesDiffer (A a) a))

117− arising from a use of ‘genericArbitrary’

118−@

119−

120−Here the @TypesDiffer@ is a type familty dealing with recursive types and

121−helping us to eliminate inproper instances. To convince the compiller, that the

122−@a@ parameter is not an @A a@ we must fix the instance with additional constraint

123−

124−@

125−instance (Arg (A a) a, Arbitrary a) => Arbitrary (A a) where

126− arbitrary = genericArbitrary

127− shrink = genericShrink

128−@

129−

130−Now everything compiles and works as expected.

30+@Foo <$> arbitrary <*> arbitrary@.

13131

13232-}

13333

13434module Test.QuickCheck.Arbitrary.Generic

135− ( -- * Main

136− genericArbitrary

137−#if MIN_VERSION_QuickCheck(2, 14, 0)

138− , GenericArbitrary(..)

139−#endif

140− , Arg

141− -- * Internal

142− , GArbitrary

143− , FiniteSum

144− , FiniteSumElem

145− , Finite

146− , AllFieldsFinal

147− , TypesDiffer

148− , ArgumentsCount

149− , SumLen

150− -- * Reexports

35+ ( GenericArbitrary(..)

15136 , Arbitrary(..)

37+ , Arg

38+ , genericArbitrary

15239 , genericShrink

15340 ) where

15441

15542import Control.Applicative

43+import Data.Coerce (coerce)

15644import Data.Proxy

15745import Data.Type.Bool

15846import GHC.Generics as G

15947import GHC.TypeLits

160−import Prelude

16148import Test.QuickCheck as QC

162−#if MIN_VERSION_QuickCheck(2, 14, 0)

163−import Data.Coerce (coerce)

16449import Test.QuickCheck.Arbitrary (GSubterms, RecursivelyShrink)

16550

166−

167−

168−-- | Newtype for @DerivingVia@

169−--

170−-- Usage:

171−--

172−-- @

173−-- data Foo = Foo

174−-- { _fooX :: X

175−-- , _fooY :: Y

176−-- } deriving (Generic)

177−-- deriving (Arbitrary) via GenericArbitrary Foo

178−-- @

179−--

180−-- @since 1.0.0

18151newtype GenericArbitrary a = GenericArbitrary { unGenericArbitrary :: a }

18252 deriving (Show, Eq)

18353

@@ -189,28 +59,13 @@ instance

18959 ) => Arbitrary (GenericArbitrary a) where

19060 arbitrary = coerce (genericArbitrary :: Gen a)

19161 shrink = coerce (genericShrink :: a -> [a])

192−#endif

193−

194−-- | Constraint helper for types with parameters

195−--

196−-- Usage:

197−--

198−-- @

199−-- data A a = A a

200−-- deriving (Generic)

201−-- instance (Arg (A a) a, Arbitrary a) => Arbitrary (A a) where

202−-- arbitrary = genericArbitrary

203−-- shrink = genericShrink

204−-- @

205−--

206−-- @since 1.0.0

207−

208−type Arg self field = (TypesDiffer self field ~ 'True)

20962

21063type family TypesDiffer a b where

21164 TypesDiffer a a = 'False

21265 TypesDiffer a b = 'True

21366

67+type Arg self field = (TypesDiffer self field ~ 'True)

68+

21469type family AllFieldsFinal self (a :: * -> *) :: Bool where

21570 AllFieldsFinal self U1 = 'True

21671 AllFieldsFinal self (a :*: b) = AllFieldsFinal self a && AllFieldsFinal self b

test/Auxiliary.hsdeleted−10

@@ -1,10 +0,0 @@

1−module Auxiliary where

2−

3−import Control.Exception

4−import Test.QuickCheck

5−

6−failGeneration :: forall a. (Arbitrary a, Show a) => IO ()

7−failGeneration = do

8− try (generate (arbitrary :: Gen a) >>= print) >>= \case

9− Left (_ :: SomeException) -> pure ()

10− Right _ -> error "Error expected"

test/EnumTest.hsdeleted−24

@@ -1,24 +0,0 @@

1−#if __GLASGOW_HASKELL__ >= 806 && __GLASGOW_HASKELL__ <= 900

2−{-# OPTIONS_GHC -fconstraint-solver-iterations=5 #-}

3−#elif __GLASGOW_HASKELL__ >= 902

4−{-# OPTIONS_GHC -fconstraint-solver-iterations=6 #-}

5−#endif

6−

7−

8−

9−module EnumTest where

10−

11−import Control.DeepSeq

12−import GHC.Generics

13−import Test.QuickCheck

14−import Test.QuickCheck.Arbitrary.Generic

15−

16−data Country = PL | GB | RU | RO | CZ | HR | SK | DE | NL | ES | BR

17− deriving (Generic, NFData, Show)

18−

19−instance Arbitrary Country where

20− arbitrary = genericArbitrary

21− shrink = genericShrink

22−

23−prop_CountryTest :: Country -> Property

24−prop_CountryTest = total

test/LimitationDemo.hs+5−12

@@ -1,3 +1,8 @@

1+{-# LANGUAGE NumDecimals #-}

2+{-# LANGUAGE DerivingStrategies #-}

3+{-# LANGUAGE DerivingVia #-}

4+{-# LANGUAGE DeriveAnyClass #-}

5+

16module LimitationDemo where

27

38import Control.DeepSeq

@@ -11,24 +16,12 @@ import Test.QuickCheck.Arbitrary.Generic

1116data R1 = R1 R2

1217 deriving (Eq, Ord, Show, Generic)

1318 deriving anyclass NFData

14−#if MIN_VERSION_QuickCheck(2, 14, 0)

1519 deriving Arbitrary via (GenericArbitrary R1)

16−#else

17−instance Arbitrary R1 where

18− arbitrary = genericArbitrary

19− shrink = genericShrink

20−#endif

2120

2221data R2 = R2 R1

2322 deriving (Eq, Ord, Show, Generic)

2423 deriving anyclass NFData

25−#if MIN_VERSION_QuickCheck(2, 14, 0)

2624 deriving Arbitrary via (GenericArbitrary R2)

27−#else

28−instance Arbitrary R2 where

29− arbitrary = genericArbitrary

30− shrink = genericShrink

31−#endif

3225

3326-- To force the instance realy be generated

3427usage :: IO ()

test/NoTypecheckTest.hs+5−3

@@ -1,11 +1,10 @@

11{-# OPTIONS_GHC -fdefer-type-errors #-}

2−{-# OPTIONS_GHC -Wno-deferred-type-errors #-}

32

43-- | Test that infinite types has no Arbitrary instance

54

65module NoTypecheckTest where

76

8−import Auxiliary

7+import Control.Exception

98import GHC.Generics (Generic)

109import Test.QuickCheck

1110import Test.QuickCheck.Arbitrary.Generic

@@ -20,4 +19,7 @@ instance Arbitrary R where

2019 shrink = genericShrink

2120

2221unit_mustFail :: IO ()

23−unit_mustFail = failGeneration @R

22+unit_mustFail = do

23+ try (generate (arbitrary :: Gen R) >>= print) >>= \case

24+ Left (_ :: SomeException) -> pure ()

25+ Right _ -> error "Error expected"

test/ParametersTest.hsdeleted−34

@@ -1,34 +0,0 @@

1−{-# OPTIONS_GHC -fdefer-type-errors #-}

2−{-# OPTIONS_GHC -Wno-deferred-type-errors #-}

3−

4−module ParametersTest where

5−

6−import Auxiliary

7−import Control.DeepSeq

8−import GHC.Generics (Generic)

9−import Test.QuickCheck

10−import Test.QuickCheck.Arbitrary.Generic

11−

12−data A a = A a

13− deriving (Eq, Ord, Show)

14− deriving anyclass NFData

15− deriving (Generic)

16−

17−instance (Arbitrary a) => Arbitrary (A a) where

18− arbitrary = genericArbitrary

19− shrink = genericShrink

20−

21−data B a = B a

22− deriving (Eq, Ord, Show)

23− deriving anyclass NFData

24− deriving (Generic)

25−

26−instance (Arg (B a) a, Arbitrary a) => Arbitrary (B a) where

27− arbitrary = genericArbitrary

28− shrink = genericShrink

29−

30−unit_argumentConstraintFail :: IO ()

31−unit_argumentConstraintFail = failGeneration @(A Int)

32−

33−prop_properArgumentConstraint :: B Int -> Property

34−prop_properArgumentConstraint = total

test/RecursiveTest.hs+2−45

@@ -1,14 +1,13 @@

11{-# LANGUAGE DerivingStrategies #-}

22{-# LANGUAGE DerivingVia #-}

33{-# LANGUAGE DeriveAnyClass #-}

4−{-# OPTIONS_GHC -fconstraint-solver-iterations=5 #-} -- GHC-9.2.4

54

65-- | Testing that our Arbitrary instances do not get stuck and respect the

76-- `size` parameter while generating.

87

98module RecursiveTest where

109

11−import Control.DeepSeq (NFData)

10+import Control.DeepSeq

1211import GHC.Generics (Generic)

1312import Test.QuickCheck

1413import Test.QuickCheck.Arbitrary.Generic

@@ -16,13 +15,7 @@ import Test.QuickCheck.Arbitrary.Generic

1615data Unit = Unit

1716 deriving (Eq, Show, Generic)

1817 deriving anyclass NFData

19−#if MIN_VERSION_QuickCheck(2, 14, 0)

2018 deriving Arbitrary via (GenericArbitrary Unit)

21−#else

22−instance Arbitrary Unit where

23− arbitrary = genericArbitrary

24− shrink = genericShrink

25−#endif

2619

2720prop_unitTotal :: Unit -> Property

2821prop_unitTotal = total

@@ -30,13 +23,7 @@ prop_unitTotal = total

3023data Single = Single Int

3124 deriving (Eq, Show, Generic)

3225 deriving anyclass NFData

33−#if MIN_VERSION_QuickCheck(2, 14, 0)

3426 deriving Arbitrary via (GenericArbitrary Single)

35−#else

36−instance Arbitrary Single where

37− arbitrary = genericArbitrary

38− shrink = genericShrink

39−#endif

4027

4128prop_singleTotal :: Single -> Property

4229prop_singleTotal = total

@@ -44,13 +31,7 @@ prop_singleTotal = total

4431data Multiple = M1 | M2 | M3 Int

4532 deriving (Eq, Show, Generic)

4633 deriving anyclass NFData

47−#if MIN_VERSION_QuickCheck(2, 14, 0)

4834 deriving Arbitrary via (GenericArbitrary Multiple)

49−#else

50−instance Arbitrary Multiple where

51− arbitrary = genericArbitrary

52− shrink = genericShrink

53−#endif

5435

5536prop_multipleTotal :: Multiple -> Property

5637prop_multipleTotal = total

@@ -61,13 +42,7 @@ data Rec = Rec

6142 , multiple :: Multiple

6243 } deriving (Eq, Show, Generic)

6344 deriving anyclass NFData

64−#if MIN_VERSION_QuickCheck(2, 14, 0)

65− deriving Arbitrary via (GenericArbitrary Rec)

66−#else

67−instance Arbitrary Rec where

68− arbitrary = genericArbitrary

69− shrink = genericShrink

70−#endif

45+ deriving Arbitrary via (GenericArbitrary Rec)

7146

7247prop_recTotal :: Rec -> Property

7348prop_recTotal = total

@@ -78,13 +53,7 @@ data Expr

7853 | Mul Expr Expr

7954 deriving (Eq, Show, Generic)

8055 deriving anyclass NFData

81−#if MIN_VERSION_QuickCheck(2, 14, 0)

8256 deriving Arbitrary via (GenericArbitrary Expr)

83−#else

84−instance Arbitrary Expr where

85− arbitrary = genericArbitrary

86− shrink = genericShrink

87−#endif

8857

8958prop_exprTotal :: Expr -> Property

9059prop_exprTotal = total

@@ -98,13 +67,7 @@ data Recursive

9867 | R5 Recursive String

9968 deriving (Eq, Show, Generic)

10069 deriving anyclass NFData

101−#if MIN_VERSION_QuickCheck(2, 14, 0)

10270 deriving Arbitrary via (GenericArbitrary Recursive)

103−#else

104−instance Arbitrary Recursive where

105− arbitrary = genericArbitrary

106− shrink = genericShrink

107−#endif

10871

10972prop_recursiveTotal :: Recursive -> Property

11073prop_recursiveTotal = total

@@ -114,13 +77,7 @@ data DeepRecursive

11477 | Short

11578 deriving (Eq, Show, Generic)

11679 deriving anyclass NFData

117−#if MIN_VERSION_QuickCheck(2, 14, 0)

11880 deriving Arbitrary via (GenericArbitrary DeepRecursive)

119−#else

120−instance Arbitrary DeepRecursive where

121− arbitrary = genericArbitrary

122− shrink = genericShrink

123−#endif

12481

12582prop_deepRecursiveTotal :: DeepRecursive -> Property

12683prop_deepRecursiveTotal = total