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View patterns, record wildcards, and record puns
[ghc-hetmet.git]
/
compiler
/
deSugar
/
DsUtils.lhs
diff --git
a/compiler/deSugar/DsUtils.lhs
b/compiler/deSugar/DsUtils.lhs
index
6e2973f
..
9d787ad
100644
(file)
--- a/
compiler/deSugar/DsUtils.lhs
+++ b/
compiler/deSugar/DsUtils.lhs
@@
-25,7
+25,7
@@
module DsUtils (
cantFailMatchResult, alwaysFailMatchResult,
extractMatchResult, combineMatchResults,
adjustMatchResult, adjustMatchResultDs,
cantFailMatchResult, alwaysFailMatchResult,
extractMatchResult, combineMatchResults,
adjustMatchResult, adjustMatchResultDs,
- mkCoLetMatchResult, mkGuardedMatchResult,
+ mkCoLetMatchResult, mkViewMatchResult, mkGuardedMatchResult,
matchCanFail, mkEvalMatchResult,
mkCoPrimCaseMatchResult, mkCoAlgCaseMatchResult,
wrapBind, wrapBinds,
matchCanFail, mkEvalMatchResult,
mkCoPrimCaseMatchResult, mkCoAlgCaseMatchResult,
wrapBind, wrapBinds,
@@
-319,6
+319,12
@@
seqVar var body = Case (Var var) var (exprType body)
mkCoLetMatchResult :: CoreBind -> MatchResult -> MatchResult
mkCoLetMatchResult bind = adjustMatchResult (mkDsLet bind)
mkCoLetMatchResult :: CoreBind -> MatchResult -> MatchResult
mkCoLetMatchResult bind = adjustMatchResult (mkDsLet bind)
+-- (mkViewMatchResult var' viewExpr var mr) makes the expression
+-- let var' = viewExpr var in mr
+mkViewMatchResult :: Id -> CoreExpr -> Id -> MatchResult -> MatchResult
+mkViewMatchResult var' viewExpr var =
+ adjustMatchResult (mkDsLet (NonRec var' (mkDsApp viewExpr (Var var))))
+
mkEvalMatchResult :: Id -> Type -> MatchResult -> MatchResult
mkEvalMatchResult var ty
= adjustMatchResult (\e -> Case (Var var) var ty [(DEFAULT, [], e)])
mkEvalMatchResult :: Id -> Type -> MatchResult -> MatchResult
mkEvalMatchResult var ty
= adjustMatchResult (\e -> Case (Var var) var ty [(DEFAULT, [], e)])