DynFlags: Support British spelling of GeneralisedNewtypeDeriving

Reviewers: dfeuer

Reviewed By: dfeuer

Subscribers: dfeuer, rwbarton, thomie, carter

GHC Trac Issues: #14819

Differential Revision: https://phabricator.haskell.org/D4422

compiler/main/DynFlags.hs

@@ -4122,6 +4122,8 @@ xFlagsDeps = [
   flagSpec "GHCForeignImportPrim"             LangExt.GHCForeignImportPrim,
   flagSpec' "GeneralizedNewtypeDeriving"      LangExt.GeneralizedNewtypeDeriving
                                               setGenDeriving,
+  flagSpec' "GeneralisedNewtypeDeriving"      LangExt.GeneralizedNewtypeDeriving
+                                              setGenDeriving,
   flagSpec "ImplicitParams"                   LangExt.ImplicitParams,
   flagSpec "ImplicitPrelude"                  LangExt.ImplicitPrelude,
   flagSpec "ImpredicativeTypes"               LangExt.ImpredicativeTypes,

docs/users_guide/8.6.1-notes.rst

@@ -54,6 +54,8 @@ Compiler
   calling the C compiler. Instead we use :ghc-flag:`-iquote` to only add it as
   an include path for `#include ""`. See :ghc-ticket:`14312`.
 
+- GHC now supports British spelling of :extension:`GeneralizedNewtypeDeriving`.
+
 Runtime system
 ~~~~~~~~~~~~~~
 

docs/users_guide/glasgow_exts.rst

@@ -4586,7 +4586,7 @@ Generalised derived instances for newtypes
                GeneralizedNewtypeDeriving
     :shortdesc: Enable newtype deriving.
-    :since: 6.8.1
+    :since: 6.8.1. British spelling since 8.6.1.
     Enable GHC's cunning generalised deriving mechanism for ``newtype``\s

testsuite/tests/driver/T4437.hs

@@ -40,7 +40,8 @@ expectedGhcOnlyExtensions = ["RelaxedLayout",
                              "AlternativeLayoutRule",
                              "AlternativeLayoutRuleTransitional",
                              "EmptyDataDeriving",
-                             "NumericUnderscores"]
+                             "NumericUnderscores",
+                             "GeneralisedNewtypeDeriving"]
 
 expectedCabalOnlyExtensions :: [String]
 expectedCabalOnlyExtensions = ["Generics",