;ci: use --pedantic for all; fix a warning with unit test suites

.github/workflows/linux-nightly.yml

@@ -172,8 +172,8 @@ jobs:
 
     - name: Build hledger and test unit tests, doc tests
       run: |
-        stack $ARGS build --ghc-options=-Werror --test --bench
-        #  --no-terminal  #  --no-run-benchmarks
+        stack $ARGS build --pedantic --test --bench
+        #  --ghc-options=-Werror --no-terminal  #  --no-run-benchmarks
       env:
         ARGS: ${{ matrix.plan.resolver }}
 

.github/workflows/mac-nightly.yml

@@ -118,6 +118,7 @@ jobs:
     - name: Build hledger and test unit tests, doc tests
       run: |
         stack build --pedantic --test
+      #  --ghc-options=-Werror
 
     - name: Install shelltestrunner
       run: |

hledger-lib/test/unittest.hs

@@ -8,6 +8,7 @@ import "hledger-lib" Hledger (tests_Hledger)
 import System.Environment (setEnv)
 import Test.Tasty (defaultMain)
 
+main :: IO ()
 main = do
   setEnv "TASTY_HIDE_SUCCESSES" "true"
   setEnv "TASTY_ANSI_TRICKS" "false"  -- helps the above

hledger/test/unittest.hs

@@ -10,6 +10,7 @@ import Hledger.Cli (tests_Hledger_Cli)
 import System.Environment (setEnv)
 import Test.Tasty (defaultMain)
 
+main :: IO ()
 main = do
   setEnv "TASTY_HIDE_SUCCESSES" "true"
   setEnv "TASTY_ANSI_TRICKS" "false"  -- helps the above