Drop support for GHC 8.4.*, update and fix dependencies (#405)

* Drop support for GHC 8.4.*, update and fix dependencies

* Remove 8.4.4 from CI

* Remove references to loopbreaker

.travis.yml

@@ -12,7 +12,6 @@ matrix:
     - ghc: "8.10.1"
     - ghc: "8.8.1"
     - ghc: "8.6.5"
-    - ghc: "8.4.4"
 
 install:
  - cabal --version
@@ -36,4 +35,3 @@ script:
 
  - cabal v2-build polysemy-plugin
  - cabal v2-test --enable-test polysemy-plugin
-

nix/overlay.nix

@@ -9,7 +9,6 @@ let
     polysemy-plugin = c2n "polysemy-plugin" ../polysemy-plugin;
     first-class-families =
       hackage "first-class-families" "0.8.0.1" "0h1rxbc7zsxrlhx5xcl58wjx3qi2wny8wb3sk7c1qnydf4ckcckz";
-    ghc-lib = hackage "ghc-lib" "0.20190204" "1i2zjlr30bxpabsm8f995x455v847gbpzczm2w4089fqmsnzpzfd";
     dump-core = hackage "dump-core" "0.1.3.2" "1mi8p736yn00z549pwnjv4ydwbs8mwg6dla3ly447c027nq8py6g";
     monadLib = hackage "monadLib" "3.10" "1v4ynjcb963s3lfw3v71qdzvld1mmz1faf8swhvicma5jbvwchy2";
   };

package.yaml

@@ -59,10 +59,6 @@ when:
       - MonadFailDesugaring
       - TypeInType
 
-#   - condition: impl(ghc >= 8.7)
-#     dependencies:
-#       - loopbreaker >= 0.1 && < 0.2
-
 flags:
   dump-core:
     description: Dump HTML for the core generated by GHC during compilation
@@ -92,13 +88,6 @@ library:
       dependencies:
         - unsupported-ghc-version > 1 && < 1
 
-    # We use this plugin to get to more agressive inlining without need for
-    # explicit "loopbreakers" in function definitions all over ther codebase
-    # --- sadly it can only work on newer versions of GHC currently
-    # - condition: impl(ghc >= 8.7)
-    #   ghc-options:
-    #     - -fplugin=Loopbreaker
-
     - condition: flag(error-messages)
       then:
         # dummy value because cabal is stupid

polysemy-plugin/package.yaml

@@ -18,7 +18,7 @@ description:         Please see the README on GitHub at <https://github.com/isov
 
 dependencies:
 - base >= 4.9 && < 5
-- ghc >= 8.4.4 && < 9
+- ghc >= 8.6.5 && < 9
 - ghc-tcplugins-extra >= 0.3 && < 0.5
 - polysemy >= 1.3
 - syb >= 0.7 && < 0.8

polysemy-plugin/polysemy-plugin.cabal

@@ -66,7 +66,7 @@ library
   build-depends:
       base >=4.9 && <5
     , containers >=0.5 && <0.7
-    , ghc >=8.4.4 && <9
+    , ghc >=8.6.5 && <9
     , ghc-tcplugins-extra >=0.3 && <0.5
     , polysemy >=1.3
     , syb ==0.7.*
@@ -112,7 +112,7 @@ test-suite polysemy-plugin-test
       base >=4.9 && <5
     , containers >=0.5 && <0.7
     , doctest >=0.16.0.1 && <0.17
-    , ghc >=8.4.4 && <9
+    , ghc >=8.6.5 && <9
     , ghc-tcplugins-extra >=0.3 && <0.5
     , hspec >=2.6.0 && <3
     , inspection-testing >=0.4.2 && <0.5

stack.yaml

@@ -1,11 +1,10 @@
-resolver: lts-16.1
+resolver: lts-16.31
 
 packages:
 - .
 - polysemy-plugin
 
 extra-deps:
-- first-class-families-0.8.0.0
-- ghc-lib-0.20190204
 - dump-core-0.1.3.2 # used when the dump-core flag is toggled
 - monadLib-3.10 # used by the dump-core library when the dump-core flag is toggled
+