diff options
Diffstat (limited to 'compiler/GHC/HsToCore/GuardedRHSs.hs')
| -rw-r--r-- | compiler/GHC/HsToCore/GuardedRHSs.hs | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/compiler/GHC/HsToCore/GuardedRHSs.hs b/compiler/GHC/HsToCore/GuardedRHSs.hs index 68162187b8..8a991e9ceb 100644 --- a/compiler/GHC/HsToCore/GuardedRHSs.hs +++ b/compiler/GHC/HsToCore/GuardedRHSs.hs @@ -30,6 +30,7 @@ import GHC.Core.Type ( Type ) import GHC.Utils.Misc import GHC.Types.SrcLoc import GHC.Utils.Outputable +import GHC.Core.Multiplicity import Control.Monad ( zipWithM ) import Data.List.NonEmpty ( NonEmpty, toList ) @@ -124,7 +125,10 @@ matchGuards (LetStmt _ binds : stmts) ctx rhs rhs_ty = do matchGuards (BindStmt _ pat bind_rhs : stmts) ctx rhs rhs_ty = do let upat = unLoc pat - match_var <- selectMatchVar upat + match_var <- selectMatchVar Many upat + -- We only allow unrestricted patterns in guard, hence the `Many` + -- above. It isn't clear what linear patterns would mean, maybe we will + -- figure it out in the future. match_result <- matchGuards stmts ctx rhs rhs_ty core_rhs <- dsLExpr bind_rhs |