Use -XNoStrictData in generated parser (#273)

Fixes #273.
haskell · Sep 13, 2024 · f936185 · f936185
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diff --git a/ChangeLog.md b/ChangeLog.md
@@ -4,6 +4,10 @@
 
 The main focus of this release was modularizing Happy.
 
+* Generated parsers now activate the language extension `-XNoStrictData` without
+  which every use of a happy parser would lead to an immediate crash (#273).
+  This causes us to drop support for GHC < 8.0.
+
 * Break up into libraries:
 
   - `happy-backend-glr`

diff --git a/packages/backend-lalr/src/Happy/Backend/LALR.hs b/packages/backend-lalr/src/Happy/Backend/LALR.hs
@@ -35,7 +35,7 @@ importsToInject debug = concat ["\n", import_array, import_bits, import_glaexts,
                            "import Control.Monad (ap)\n"
 
 langExtsToInject :: [String]
-langExtsToInject = ["MagicHash", "BangPatterns", "TypeSynonymInstances", "FlexibleInstances"]
+langExtsToInject = ["MagicHash", "BangPatterns", "TypeSynonymInstances", "FlexibleInstances", "NoStrictData"]
 
 defines :: Bool -> Bool -> String
 defines debug coerce = unlines [ "#define " ++ d ++ " 1" | d <- vars_to_define ]