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-rw-r--r--lib/Wayland/Display.lean3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/Wayland/Display.lean b/lib/Wayland/Display.lean
index 63bd70d..704d7d4 100644
--- a/lib/Wayland/Display.lean
+++ b/lib/Wayland/Display.lean
@@ -21,7 +21,7 @@ section Interfaces
/-- The name of an interface (e.g., `"wl_display"`), commonly used to resolve the corresponding interface description
using the `Interface` class. -/
def InterfaceName : Type := String
- deriving Repr, Nonempty, BEq, ToString
+ deriving Repr, Nonempty, BEq, ToString, Hashable
/-- The numeric identifier of a request/event in an interface. -/
def OpCode : Type := UInt32
@@ -145,6 +145,7 @@ def DisplayM (σ : Type) : Type → Type :=
deriving instance Monad for DisplayM σ
deriving instance MonadState σ for DisplayM σ
+deriving instance MonadExcept IO.Error for DisplayM σ
private instance : MonadLift (ReaderT (Display σ) (StateT σ IO)) (DisplayM σ) where
monadLift := id