import HsSyn ( Stmt(..), HsExpr(..), GRHSs(..), GRHS(..), HsMatchContext(..) )
import TcHsSyn ( TypecheckedGRHSs, TypecheckedPat, TypecheckedStmt, TypecheckedMatchContext )
import CoreSyn ( CoreExpr )
-import TcType ( Type )
+import Type ( Type )
import DsMonad
import DsUtils
+import Unique ( Uniquable(..) )
import PrelInfo ( nON_EXHAUSTIVE_GUARDS_ERROR_ID )
-import PrelNames ( otherwiseIdKey, trueDataConKey, hasKey )
+import TysWiredIn ( trueDataConId )
+import PrelNames ( otherwiseIdKey, hasKey )
\end{code}
@dsGuarded@ is used for both @case@ expressions and pattern bindings.
-> TypecheckedGRHSs -- Guarded RHSs
-> DsM (Type, MatchResult)
-dsGRHSs kind pats (GRHSs grhss binds (Just ty))
+dsGRHSs kind pats (GRHSs grhss binds ty)
= mapDs (dsGRHS kind pats) grhss `thenDs` \ match_results ->
let
match_result1 = foldr1 combineMatchResults match_results
-> DsMatchContext -- Context
-> DsM MatchResult
--- See comments with HsExpr.HsStmt re what an ExprStmt means
+-- See comments with HsExpr.Stmt re what an ExprStmt means
-- Here we must be in a guard context (not do-expression, nor list-comp)
matchGuard [ResultStmt expr locn] ctx
-- ExprStmts must be guards
-- Turn an "otherwise" guard is a no-op
-matchGuard (ExprStmt (HsVar v) _ : stmts) ctx
+matchGuard (ExprStmt (HsVar v) _ _ : stmts) ctx
| v `hasKey` otherwiseIdKey
- || v `hasKey` trueDataConKey
+ || v `hasKey` getUnique trueDataConId
+ -- trueDataConId doesn't have the same
+ -- unique as trueDataCon
= matchGuard stmts ctx
-matchGuard (ExprStmt expr locn : stmts) ctx
+matchGuard (ExprStmt expr _ locn : stmts) ctx
= matchGuard stmts ctx `thenDs` \ match_result ->
putSrcLocDs locn (dsExpr expr) `thenDs` \ pred_expr ->
returnDs (mkGuardedMatchResult pred_expr match_result)