Add MultilineStrings extension

Cabal-syntax/src/Language/Haskell/Extension.hs

@@ -551,6 +551,8 @@ data KnownExtension
   | -- | Allow the use of built-in syntax for list, tuple and sum type constructors
     -- rather than being exclusive to data constructors.
     ListTuplePuns
+  | -- | Support multiline strings
+    MultilineStrings
   deriving (Generic, Show, Read, Eq, Ord, Enum, Bounded, Typeable, Data)
 
 instance Binary KnownExtension

Cabal-tests/tests/UnitTests/Distribution/Utils/Structured.hs

@@ -31,15 +31,15 @@ md5Check proxy md5Int = structureHash proxy @?= md5FromInteger md5Int
 md5CheckGenericPackageDescription :: Proxy GenericPackageDescription -> Assertion
 md5CheckGenericPackageDescription proxy = md5Check proxy
 #if MIN_VERSION_base(4,19,0)
-    0x3da8883a286b8fbfd9f94790d57cc06e
+    0x62ad178a75f041af29947c9b3d83e6ed
 #else
-    0x245e544da05f50f9dd0339a96ac99860
+    0xba8f0baa8074fd238ad36a309399349e
 #endif
 
 md5CheckLocalBuildInfo :: Proxy LocalBuildInfo -> Assertion
 md5CheckLocalBuildInfo proxy = md5Check proxy
 #if MIN_VERSION_base(4,19,0)
-    0x7683c2daece12ba7982e80f860454f47
+    0xc68e9c0758c4bf2d72fe82b3d55cee34
 #else
-    0xe694b39b10bc861f47ea9c7b926a422a
+    0xcf7e7bbcaec504d745fe086eec1786ff
 #endif

changelog.d/pr-10245

@@ -0,0 +1,8 @@
+synopsis: Add MultilineStrings extension
+packages: Cabal-syntax
+prs: #10245
+description: {
+
+- adds support for the `MultilineStrings` language extension (GHC proposal #637)
+
+}

editors/vim/syntax/cabal.vim

@@ -219,6 +219,7 @@ syn keyword cabalExtension contained
   \ MonoLocalBinds
   \ MonoPatBinds
   \ MonomorphismRestriction
+  \ MultilineStrings
   \ MultiParamTypeClasses
   \ MultiWayIf
   \ NPlusKPatterns