Implement 'Attempt to fill hole' code action

cabal.project

@@ -20,6 +20,6 @@ package ghcide
 
 write-ghc-environment-files: never
 
-index-state: 2020-09-23T17:24:43Z
+index-state: 2020-09-30T21:52:43Z
 
 allow-newer: data-tree-print:base

haskell-language-server.cabal

@@ -80,7 +80,7 @@ library
 executable haskell-language-server
   import:           agpl, common-deps
   main-is:          Main.hs
-  hs-source-dirs:   exe plugins/default/src
+  hs-source-dirs:   exe plugins/default/src plugins/tactics/src
   other-modules:
     Ide.Plugin.Eval
     Ide.Plugin.Example
@@ -93,9 +93,17 @@ executable haskell-language-server
     Ide.Plugin.Retrie
     Ide.Plugin.StylishHaskell
     Ide.Plugin.Tactic
-    Ide.Plugin.Tactic.Types
+    Ide.Plugin.Tactic.CodeGen
+    Ide.Plugin.Tactic.Context
+    Ide.Plugin.Tactic.Debug
+    Ide.Plugin.Tactic.GHC
+    Ide.Plugin.Tactic.Judgements
     Ide.Plugin.Tactic.Machinery
+    Ide.Plugin.Tactic.Naming
+    Ide.Plugin.Tactic.Range
     Ide.Plugin.Tactic.Tactics
+    Ide.Plugin.Tactic.Types
+    Ide.Plugin.Tactic.TestTypes
     Ide.TreeTransform
 
   ghc-options:
@@ -147,8 +155,9 @@ executable haskell-language-server
     , transformers
     , unordered-containers
     , ghc-source-gen
-    , refinery
+    , refinery                 >=0.2.0.0
     , ghc-exactprint
+    , fingertree
 
   if flag(agpl)
     build-depends: brittany
@@ -237,7 +246,8 @@ test-suite func-test
     , tasty-golden
     , tasty-rerun
 
-  hs-source-dirs:     test/functional plugins/default/src
+  hs-source-dirs:     test/functional plugins/tactics/src
+
   main-is:            Main.hs
   other-modules:
     Command
@@ -258,7 +268,7 @@ test-suite func-test
     Symbol
     TypeDefinition
     Tactic
-    Ide.Plugin.Tactic.Types
+    Ide.Plugin.Tactic.TestTypes
 
   ghc-options:
     -Wall -Wno-name-shadowing -threaded -rtsopts -with-rtsopts=-N