Work around missing type signature in Happy

Happy generates

      notHappyAtAll = error "Blah"

without a type signature, and currently the new
typechecker doesn't generalise it.  This patch
says "no monomorphism restriction" which makes it
generalise again.

Better would be to add a type sig to Happy's template

diff --git a/compiler/cmm/CmmParse.y b/compiler/cmm/CmmParse.y
index 7ad1dd5..ad388e5 100644 (file)
--- a/compiler/cmm/CmmParse.y
+++ b/compiler/cmm/CmmParse.y
@@ -9,7 +9,15 @@
 -----------------------------------------------------------------------------
 
 {
-{-# OPTIONS -Wwarn -w #-}
+{-# OPTIONS -Wwarn -w -XNoMonomorphismRestriction #-}
+-- The NoMonomorphismRestriction deals with a Happy infelicity
+--    With OutsideIn's more conservativ monomorphism restriction
+--    we aren't generalising
+--        notHappyAtAll = error "urk"
+--    which is terrible.  Switching off the restriction allows
+--    the generalisation.  Better would be to make Happy generate
+--    an appropriate signature.
+--
 -- The above warning supression flag is a temporary kludge.
 -- While working on this module you are encouraged to remove it and fix
 -- any warnings in the module. See

diff --git a/compiler/parser/Parser.y.pp b/compiler/parser/Parser.y.pp
index 6f1b2e4..b0b7751 100644 (file)
--- a/compiler/parser/Parser.y.pp
+++ b/compiler/parser/Parser.y.pp
@@ -8,7 +8,15 @@
 -- ---------------------------------------------------------------------------
 
 {
-{-# OPTIONS -Wwarn -w #-}
+{-# OPTIONS -Wwarn -w -XNoMonomorphismRestriction #-}
+-- The NoMonomorphismRestriction deals with a Happy infelicity
+--    With OutsideIn's more conservativ monomorphism restriction
+--    we aren't generalising
+--        notHappyAtAll = error "urk"
+--    which is terrible.  Switching off the restriction allows
+--    the generalisation.  Better would be to make Happy generate
+--    an appropriate signature.
+
 -- The above warning supression flag is a temporary kludge.
 -- While working on this module you are encouraged to remove it and fix
 -- any warnings in the module. See

diff --git a/compiler/parser/ParserCore.y b/compiler/parser/ParserCore.y
index 0289cfc..8cfafae 100644 (file)
--- a/compiler/parser/ParserCore.y
+++ b/compiler/parser/ParserCore.y
@@ -1,5 +1,13 @@
 {
-{-# OPTIONS -Wwarn -w #-}
+{-# OPTIONS -Wwarn -w -XNoMonomorphismRestriction #-}
+-- The NoMonomorphismRestriction deals with a Happy infelicity
+--    With OutsideIn's more conservativ monomorphism restriction
+--    we aren't generalising
+--        notHappyAtAll = error "urk"
+--    which is terrible.  Switching off the restriction allows
+--    the generalisation.  Better would be to make Happy generate
+--    an appropriate signature.
+--
 -- The above warning supression flag is a temporary kludge.
 -- While working on this module you are encouraged to remove it and fix
 -- any warnings in the module. See

diff --git a/utils/hpc/HpcParser.y b/utils/hpc/HpcParser.y
index b99e324..b4d8c79 100644 (file)
--- a/utils/hpc/HpcParser.y
+++ b/utils/hpc/HpcParser.y
@@ -1,5 +1,13 @@
 { 
-{-# OPTIONS -Wwarn #-}
+{-# OPTIONS -Wwarn -XNoMonomorphismRestriction #-}
+-- The NoMonomorphismRestriction deals with a Happy infelicity
+--    With OutsideIn's more conservativ monomorphism restriction
+--    we aren't generalising
+--        notHappyAtAll = error "urk"
+--    which is terrible.  Switching off the restriction allows
+--    the generalisation.  Better would be to make Happy generate
+--    an appropriate signature.
+--
 -- The above warning supression flag is a temporary kludge.
 -- While working on this module you are encouraged to remove it and fix
 -- any warnings in the module. See