Add has_free_tyvars predicate.

[matthijs/master-project/cλash.git] / CoreTools.hs

diff --git a/CoreTools.hs b/CoreTools.hs
index 444a4ba6c2ab7e469e164b030f77b5067c905459..4cafec1b34f8225870b4cb6b32af8ee03505936a 100644 (file)
--- a/CoreTools.hs
+++ b/CoreTools.hs
@@ -22,8 +22,10 @@ import qualified DynFlags
 import qualified SrcLoc
 import qualified CoreSyn
 import qualified Var
+import qualified VarSet
 import qualified Unique
 import qualified CoreUtils
+import qualified CoreFVs
 
 import GhcTools
 import HsTools
@@ -117,3 +119,6 @@ is_var :: CoreSyn.CoreExpr -> Bool
 is_var (CoreSyn.Var _) = True
 is_var _ = False
 
+-- Does the given CoreExpr have any free type vars?
+has_free_tyvars :: CoreSyn.CoreExpr -> Bool
+has_free_tyvars = not . VarSet.isEmptyVarSet . (CoreFVs.exprSomeFreeVars Var.isTyVar)