import Type
import CoreSyn
import CoreUtils
+import MkCore
import DynFlags
import CostCentre
= uncurry mkLams <$> matchWrapper LambdaExpr a_Match
dsExpr (HsApp fun arg)
- = mkDsApp <$> dsLExpr fun <*> dsLExpr arg
+ = mkCoreApp <$> dsLExpr fun <*> dsLExpr arg
\end{code}
Operator sections. At first it looks as if we can convert
\begin{code}
dsExpr (OpApp e1 op _ e2)
= -- for the type of y, we need the type of op's 2nd argument
- mkDsApps <$> dsLExpr op <*> mapM dsLExpr [e1, e2]
+ mkCoreApps <$> dsLExpr op <*> mapM dsLExpr [e1, e2]
dsExpr (SectionL expr op) -- Desugar (e !) to ((!) e)
- = mkDsApp <$> dsLExpr op <*> dsLExpr expr
+ = mkCoreApp <$> dsLExpr op <*> dsLExpr expr
-- dsLExpr (SectionR op expr) -- \ x -> op x expr
dsExpr (SectionR op expr) = do
x_id <- newSysLocalDs x_ty
y_id <- newSysLocalDs y_ty
return (bindNonRec y_id y_core $
- Lam x_id (mkDsApps core_op [Var x_id, Var y_id]))
+ Lam x_id (mkCoreApps core_op [Var x_id, Var y_id]))
dsExpr (HsSCC cc expr) = do
mod_name <- getModuleDs
dsExpr (HsCoreAnn fs expr)
= Note (CoreNote $ unpackFS fs) <$> dsLExpr expr
-dsExpr (HsCase discrim matches) = do
- core_discrim <- dsLExpr discrim
- ([discrim_var], matching_code) <- matchWrapper CaseAlt matches
- return (scrungleMatch discrim_var core_discrim matching_code)
+dsExpr (HsCase discrim matches@(MatchGroup _ rhs_ty))
+ | isEmptyMatchGroup matches -- A Core 'case' is always non-empty
+ = -- So desugar empty HsCase to error call
+ mkErrorAppDs pAT_ERROR_ID (funResultTy rhs_ty) "case"
+
+ | otherwise
+ = do { core_discrim <- dsLExpr discrim
+ ; ([discrim_var], matching_code) <- matchWrapper CaseAlt matches
+ ; return (scrungleMatch discrim_var core_discrim matching_code) }
-- Pepe: The binds are in scope in the body but NOT in the binding group
-- This is to avoid silliness in breakpoints