Fix doctests

.github/workflows/doctest.yml

@@ -0,0 +1,16 @@
+name: doctest
+
+on:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  doctest:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      # NOTE: We can't use `cabal doctest` here, as `cabal doctest` uses
+      # `--build-depends=QuickCheck`, which results in a dependency cycle.
+      - run: cabal install doctest --ignore-project --overwrite-policy=always && cabal build && cabal repl --build-depends=unliftio --with-compiler=doctest --repl-options='-w -Wdefault'

.gitignore

@@ -1,3 +1,4 @@
-stack.yaml.lock
-.stack-work/
-cabal.project.local
+/dist-newstyle/
+/stack.yaml.lock
+/.stack-work/
+/cabal.project.local

random.cabal

@@ -123,22 +123,6 @@ test-suite legacy-test
         containers >=0.5 && <0.7,
         random
 
-test-suite doctests
-    type:             exitcode-stdio-1.0
-    main-is:          doctests.hs
-    hs-source-dirs:   test
-    default-language: Haskell2010
-    build-depends:
-        base,
-        doctest >=0.15 && <0.23
-    if impl(ghc >= 8.2) && impl(ghc < 8.10)
-        build-depends:
-            primitive >=0.6 && <0.8,
-            random,
-            stm,
-            unliftio >=0.2 && <0.3,
-            vector >= 0.10 && <0.14
-
 test-suite spec
     type:             exitcode-stdio-1.0
     main-is:          Spec.hs

src/System/Random.hs

@@ -354,7 +354,7 @@ class Random a where
   -- independently:
   --
   -- >>> fst $ randomR (('a', 5.0), ('z', 10.0)) $ mkStdGen 2021
-  -- ('t',6.240232662366563)
+  -- ('t',6.240232662366564)
   --
   -- In case when a lawful range is desired `uniformR` should be used
   -- instead.
@@ -642,7 +642,7 @@ newStdGen = liftIO $ atomicModifyIORef' theStdGen splitGen
 --
 -- >>> rollDice = getStdRandom (randomR (1, 6))
 -- >>> replicateM 10 (rollDice :: IO Int)
--- [5,6,6,1,1,6,4,2,4,1]
+-- [1,1,1,4,5,6,1,2,2,5]
 --
 -- This is an outdated function and it is recommended to switch to its
 -- equivalent 'System.Random.Stateful.applyAtomicGen' instead, possibly with the
@@ -652,7 +652,7 @@ newStdGen = liftIO $ atomicModifyIORef' theStdGen splitGen
 -- >>> import System.Random.Stateful
 -- >>> rollDice = applyAtomicGen (uniformR (1, 6)) globalStdGen
 -- >>> replicateM 10 (rollDice :: IO Int)
--- [4,6,1,1,4,4,3,2,1,2]
+-- [2,1,1,5,4,3,6,6,3,2]
 --
 -- @since 1.0.0
 getStdRandom :: MonadIO m => (StdGen -> (a, StdGen)) -> m a
@@ -664,7 +664,7 @@ getStdRandom f = liftIO $ atomicModifyIORef' theStdGen (swap . f)
 -- pseudo-random number generator 'System.Random.Stateful.globalStdGen'
 --
 -- >>> randomRIO (2020, 2100) :: IO Int
--- 2040
+-- 2028
 --
 -- Similar to 'randomIO', this function is equivalent to @'getStdRandom'
 -- 'randomR'@ and is included in this interface for historical reasons and
@@ -675,7 +675,7 @@ getStdRandom f = liftIO $ atomicModifyIORef' theStdGen (swap . f)
 --
 -- >>> import System.Random.Stateful
 -- >>> uniformRM (2020, 2100) globalStdGen :: IO Int
--- 2079
+-- 2044
 --
 -- @since 1.0.0
 randomRIO :: (Random a, MonadIO m) => (a, a) -> m a
@@ -686,7 +686,7 @@ randomRIO range = getStdRandom (randomR range)
 --
 -- >>> import Data.Int
 -- >>> randomIO :: IO Int32
--- -1580093805
+-- 114794456
 --
 -- This function is equivalent to @'getStdRandom' 'random'@ and is included in
 -- this interface for historical reasons and backwards compatibility. It is
@@ -696,7 +696,7 @@ randomRIO range = getStdRandom (randomR range)
 --
 -- >>> import System.Random.Stateful
 -- >>> uniformM globalStdGen :: IO Int32
--- -1649127057
+-- -1768545016
 --
 -- @since 1.0.0
 randomIO :: (Random a, MonadIO m) => m a
@@ -842,3 +842,4 @@ randomIO = getStdRandom random
 --
 -- >>> import Control.Monad (replicateM)
 -- >>> import Data.List (unfoldr)
+-- >>> setStdGen (mkStdGen 0)

src/System/Random/Internal.hs

@@ -956,7 +956,7 @@ class Uniform a where
   --
   -- There is a default implementation via 'Generic':
   --
-  -- >>> :set -XDeriveGeneric -XDeriveAnyClass
+  -- >>> :seti -XDeriveGeneric -XDeriveAnyClass
   -- >>> import GHC.Generics (Generic)
   -- >>> import System.Random.Stateful
   -- >>> data MyBool = MyTrue | MyFalse deriving (Show, Generic, Finite, Uniform)
@@ -1015,7 +1015,7 @@ finiteUniformM = fmap toGFinite . case gcardinality (proxy# :: Proxy# f) of
 -- If your data has several fields of sub-'Word' cardinality,
 -- this instance may be more efficient than one, derived via 'Generic' and 'GUniform'.
 --
--- >>> :set -XDeriveGeneric -XDeriveAnyClass
+-- >>> :seti -XDeriveGeneric -XDeriveAnyClass
 -- >>> import GHC.Generics (Generic)
 -- >>> import System.Random.Stateful
 -- >>> data Triple = Triple Word8 Word8 Word8 deriving (Show, Generic, Finite)
@@ -1055,7 +1055,7 @@ class UniformRange a where
   --
   -- There is a default implementation via 'Generic':
   --
-  -- >>> :set -XDeriveGeneric -XDeriveAnyClass
+  -- >>> :seti -XDeriveGeneric -XDeriveAnyClass
   -- >>> import GHC.Generics (Generic)
   -- >>> import Data.Word (Word8)
   -- >>> import Control.Monad (replicateM)

src/System/Random/Stateful.hs

@@ -308,7 +308,7 @@ withMutableGen_ fg action = thawGen fg >>= action
 --
 -- >>> :set -XTypeApplications
 -- >>> randomM @Double g
--- 0.6268211351114487
+-- 0.6268211351114488
 --
 -- @since 1.2.0
 randomM :: forall a g m. (Random a, RandomGen g, FrozenGen g m) => MutableGen g m -> m a

stack-old.yaml

@@ -3,8 +3,6 @@ packages:
 - .
 extra-deps:
 - splitmix-0.1@sha256:d50c4d0801a35be7875a040470c09863342514930c82a7d25780a6c2efc4fda9,5249
-- doctest-0.16.2@sha256:2f96e9bbe9aee11b47453c82c24b3dc76cdbb8a2a7c984dfd60b4906d08adf68,6942
-- cabal-doctest-1.0.8@sha256:34dff6369d417df2699af4e15f06bc181d495eca9c51efde173deae2053c197c,1491
 - rdtsc-1.3.0.1@sha256:0a6e8dc715ba82ad72c7e2b1c2f468999559bec059d50540719a80b00dcc4e66,1557
 - smallcheck-1.2.0@sha256:8b431572e6a0503223e0e52014d41084c1b01f2aeea3bd499f6f529b3f6dfa89,1482
 - tasty-1.3.1@sha256:01e35c97f7ee5ccbc28f21debea02a38cd010d53b4c3087f5677c5d06617a507,2520