diff --git a/Editor/Inspector/LogoDisplay.cs b/Editor/Inspector/LogoDisplay.cs
index c583b297..43b55051 100644
--- a/Editor/Inspector/LogoDisplay.cs
+++ b/Editor/Inspector/LogoDisplay.cs
@@ -18,7 +18,7 @@ namespace nadena.dev.modular_avatar.core.editor
                 {
                     return (EditorStyles.label?.lineHeight ?? 0) * 3;
                 }
-                catch (NullReferenceException e)
+                catch (NullReferenceException)
                 {
                     // This can happen in early initialization...
                     return 0;
diff --git a/Editor/Inspector/MaterialSetter/MaterialSwitchObjectEditor.cs b/Editor/Inspector/MaterialSetter/MaterialSwitchObjectEditor.cs
index f789cc29..95013d55 100644
--- a/Editor/Inspector/MaterialSetter/MaterialSwitchObjectEditor.cs
+++ b/Editor/Inspector/MaterialSetter/MaterialSwitchObjectEditor.cs
@@ -3,7 +3,6 @@
 using UnityEditor;
 using UnityEditor.UIElements;
 using UnityEngine;
-using UnityEngine.UI;
 using UnityEngine.UIElements;
 
 #endregion
@@ -148,7 +147,7 @@ namespace nadena.dev.modular_avatar.core.editor.ShapeChanger
                 {
                     return targetObject?.GetComponent<Renderer>()?.sharedMaterials;
                 }
-                catch (MissingComponentException e)
+                catch (MissingComponentException)
                 {
                     return null;
                 }
diff --git a/Editor/Inspector/Menu/ToggleCreatorShortcut.cs b/Editor/Inspector/Menu/ToggleCreatorShortcut.cs
index dfd18712..e549d319 100644
--- a/Editor/Inspector/Menu/ToggleCreatorShortcut.cs
+++ b/Editor/Inspector/Menu/ToggleCreatorShortcut.cs
@@ -30,7 +30,7 @@ namespace nadena.dev.modular_avatar.core.editor
                     createInstaller = false;
                 }
             }
-            catch (MissingComponentException e)
+            catch (MissingComponentException)
             {
                 // ignore
             }
diff --git a/Editor/Inspector/ShapeChanger/ChangedShapeEditor.cs b/Editor/Inspector/ShapeChanger/ChangedShapeEditor.cs
index 8b17c58a..bb3c84cd 100644
--- a/Editor/Inspector/ShapeChanger/ChangedShapeEditor.cs
+++ b/Editor/Inspector/ShapeChanger/ChangedShapeEditor.cs
@@ -64,7 +64,7 @@ namespace nadena.dev.modular_avatar.core.editor.ShapeChanger
                         .Select(x => mesh.GetBlendShapeName(x))
                         .ToList();
                 }
-                catch (MissingComponentException e)
+                catch (MissingComponentException)
                 {
                     shapeNames = null;
                 }
diff --git a/Editor/OptimizationPasses/GCGameObjectsPass.cs b/Editor/OptimizationPasses/GCGameObjectsPass.cs
index 2dae8023..0214494a 100644
--- a/Editor/OptimizationPasses/GCGameObjectsPass.cs
+++ b/Editor/OptimizationPasses/GCGameObjectsPass.cs
@@ -2,7 +2,7 @@
 using System.Collections.Generic;
 using UnityEditor;
 using UnityEngine;
-
+using Object = UnityEngine.Object;
 #if MA_VRCSDK3_AVATARS
 using VRC.SDK3.Dynamics.PhysBone.Components;
 #endif
@@ -123,7 +123,7 @@ namespace nadena.dev.modular_avatar.core.editor
                         }
                     }
                 }
-                catch (MissingComponentException _)
+                catch (MissingComponentException)
                 {
                     // No animator? weird. Move on.
                 }
@@ -194,7 +194,7 @@ namespace nadena.dev.modular_avatar.core.editor
             {
                 if (!referencedGameObjects.Contains(go))
                 {
-                    UnityEngine.Object.DestroyImmediate(go);
+                    Object.DestroyImmediate(go);
                 }
             }
         }
diff --git a/Editor/ParamsUsage/ParamsUsageWindow.cs b/Editor/ParamsUsage/ParamsUsageWindow.cs
index 4d8f58ee..a7943a77 100644
--- a/Editor/ParamsUsage/ParamsUsageWindow.cs
+++ b/Editor/ParamsUsage/ParamsUsageWindow.cs
@@ -109,7 +109,7 @@ namespace nadena.dev.modular_avatar.core.editor
             {
                 return uxml != null && EditorStyles.label != null;
             }
-            catch (NullReferenceException _)
+            catch (NullReferenceException)
             {
                 return false;
             }
diff --git a/Editor/ReactiveObjects/AnimationGeneration/ReactiveObjectAnalyzer.cs b/Editor/ReactiveObjects/AnimationGeneration/ReactiveObjectAnalyzer.cs
index 42f11821..b7482b27 100644
--- a/Editor/ReactiveObjects/AnimationGeneration/ReactiveObjectAnalyzer.cs
+++ b/Editor/ReactiveObjects/AnimationGeneration/ReactiveObjectAnalyzer.cs
@@ -157,9 +157,7 @@ namespace nadena.dev.modular_avatar.core.editor
                         if (condition.ReferenceObject != null && !toggledObjects.Contains(condition.ReferenceObject))
                             condition.IsConstant = asc.AnimationDatabase.ClipsForPath(asc.PathMappings.GetObjectIdentifier(condition.ReferenceObject)).IsEmpty;
 
-                    var i = 0;
                     // Remove redundant active conditions.
-                    int retain = 0;
                     actionGroup.ControllingConditions.RemoveAll(c => c.IsConstant && c.InitiallyActive);
                 }
 
diff --git a/Editor/ReactiveObjects/RemoveBlendShapeFromMesh.cs b/Editor/ReactiveObjects/RemoveBlendShapeFromMesh.cs
index 25a268df..c1105a64 100644
--- a/Editor/ReactiveObjects/RemoveBlendShapeFromMesh.cs
+++ b/Editor/ReactiveObjects/RemoveBlendShapeFromMesh.cs
@@ -128,7 +128,7 @@ namespace nadena.dev.modular_avatar.core.editor
                         n_nrm[i] = o_nrm[newToOrigVertIndex[i]];
                         n_tan[i] = o_tan[newToOrigVertIndex[i]];
                     }
-                    catch (IndexOutOfRangeException e)
+                    catch (IndexOutOfRangeException)
                     {
                         throw;
                     }
@@ -250,7 +250,6 @@ namespace nadena.dev.modular_avatar.core.editor
         {
             List<int> n2o = new List<int>(toRetainVertices.Length);
             List<int> o2n = new List<int>(toRetainVertices.Length);
-            int i = 0;
 
             for (int j = 0; j < toRetainVertices.Length; j++)
             {
diff --git a/Editor/SetupOutfit.cs b/Editor/SetupOutfit.cs
index 6c263c89..922fbc74 100644
--- a/Editor/SetupOutfit.cs
+++ b/Editor/SetupOutfit.cs
@@ -385,8 +385,6 @@ namespace nadena.dev.modular_avatar.core.editor
 
         private static bool ValidateSetupOutfit(GameObject gameObj)
         {
-            Object obj;
-
             if (gameObj == null)
             {
                 errorHeader = S("setup_outfit.err.header.notarget");
diff --git a/UnitTests~/Animation/AvatarMask/AvatarMaskTest.cs b/UnitTests~/Animation/AvatarMask/AvatarMaskTest.cs
index aec7e15a..897e323f 100644
--- a/UnitTests~/Animation/AvatarMask/AvatarMaskTest.cs
+++ b/UnitTests~/Animation/AvatarMask/AvatarMaskTest.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using nadena.dev.ndmf;
 using NUnit.Framework;
@@ -28,6 +29,11 @@ namespace modular_avatar_tests
                 return transformMaskElements.SequenceEqual(other.transformMaskElements);
             }
 
+            public override int GetHashCode()
+            {
+                return HashCode.Combine(humanoidMaskElements, transformMaskElements);
+            }
+
             public static ExtractedMask FromAvatarMask(AvatarMask mask)
             {
                 var so = new SerializedObject(mask);