Enable hls-tactics-plugin tests in CI (#1474)

* Enable hls-tactics-plugin tests in CI

* Revert a bug in `auto` that caused test failures

Author: isovector

.github/workflows/test.yml

@@ -119,3 +119,8 @@ jobs:
         # all functional test cases simultaneously which causes way too many hls
         # instances to be spun up for the poor github actions runner to handle
         run: cabal test wrapper-test --test-options="-j1" || cabal test wrapper-test --test-options="-j1" || cabal test wrapper-test --test-options="-j1"
+
+      - name: Test hls-tactics-plugin test suite
+        if: ${{ matrix.test }}
+        run: LSP_TEST_LOG_COLOR=0 LSP_TEST_LOG_MESSAGES=true LSP_TEST_LOG_STDERR=true cabal test hls-tactics-plugin --test-options="-j1"
+

plugins/hls-tactics-plugin/src/Ide/Plugin/Tactic/KnownStrategies.hs

@@ -2,14 +2,14 @@
 
 module Ide.Plugin.Tactic.KnownStrategies where
 
-import           Control.Monad.Error.Class
-import           Ide.Plugin.Tactic.Context                    (getCurrentDefinitions)
-import           Ide.Plugin.Tactic.KnownStrategies.QuickCheck (deriveArbitrary)
-import           Ide.Plugin.Tactic.Machinery                  (tracing, try')
-import           Ide.Plugin.Tactic.Tactics
-import           Ide.Plugin.Tactic.Types
-import           OccName                                      (mkVarOcc)
-import           Refinery.Tactic
+import Control.Monad.Error.Class
+import Ide.Plugin.Tactic.Context (getCurrentDefinitions)
+import Ide.Plugin.Tactic.KnownStrategies.QuickCheck (deriveArbitrary)
+import Ide.Plugin.Tactic.Machinery (tracing)
+import Ide.Plugin.Tactic.Tactics
+import Ide.Plugin.Tactic.Types
+import OccName (mkVarOcc)
+import Refinery.Tactic
 
 
 knownStrategies :: TacticsM ()
@@ -29,7 +29,7 @@ known name t = do
 
 deriveFmap :: TacticsM ()
 deriveFmap = do
-  try' intros
+  try intros
   overAlgebraicTerms homo
   choice
     [ overFunctions apply >> auto' 2

plugins/hls-tactics-plugin/src/Ide/Plugin/Tactic/Machinery.hs

@@ -278,6 +278,10 @@ requireConcreteHole m = do
 -- balloons the search space. This thing just tries it, but doesn't backtrack
 -- if it fails.
 --
+-- NOTE(sandy): But there's a bug! Or at least, something not understood here.
+-- Using this everywhere breaks te tests, and neither I nor TOTBWF are sure
+-- why.  Prefer 'try' if you can, and only try this as a last resort.
+--
 -- TODO(sandy): Remove this when we upgrade to 0.4
 try'
     :: Functor m

plugins/hls-tactics-plugin/src/Ide/Plugin/Tactic/Tactics.hs

@@ -319,7 +319,7 @@ auto' :: Int -> TacticsM ()
 auto' 0 = throwError NoProgress
 auto' n = do
   let loop = auto' (n - 1)
-  try' intros
+  try intros
   choice
     [ overFunctions $ \fname -> do
         apply fname