diff --git a/OpenRA.Game/Game.cs b/OpenRA.Game/Game.cs
index e5a0e8c3fb..5a0c05ab05 100644
--- a/OpenRA.Game/Game.cs
+++ b/OpenRA.Game/Game.cs
@@ -355,7 +355,7 @@ namespace OpenRA
 
 			ExternalMods = new ExternalMods();
 
-			if (modID != null && Mods.TryGetValue(modID, out var currentMod))
+			if (modID != null && Mods.TryGetValue(modID, out _))
 			{
 				var launchPath = args.GetValue("Engine.LaunchPath", Assembly.GetEntryAssembly().Location);
 
diff --git a/OpenRA.Game/Graphics/SpriteLoader.cs b/OpenRA.Game/Graphics/SpriteLoader.cs
index db393b9d79..ec6da2ddd3 100644
--- a/OpenRA.Game/Graphics/SpriteLoader.cs
+++ b/OpenRA.Game/Graphics/SpriteLoader.cs
@@ -139,7 +139,7 @@ namespace OpenRA.Graphics
 
 		public FrameCache(IReadOnlyFileSystem fileSystem, ISpriteLoader[] loaders)
 		{
-			frames = new Cache<string, ISpriteFrame[]>(filename => FrameLoader.GetFrames(fileSystem, filename, loaders, out var metadata));
+			frames = new Cache<string, ISpriteFrame[]>(filename => FrameLoader.GetFrames(fileSystem, filename, loaders, out _));
 		}
 
 		public ISpriteFrame[] this[string filename] { get { return frames[filename]; } }
diff --git a/OpenRA.Mods.Cnc/FileSystem/MixFile.cs b/OpenRA.Mods.Cnc/FileSystem/MixFile.cs
index a7954dd35f..dfdb890560 100644
--- a/OpenRA.Mods.Cnc/FileSystem/MixFile.cs
+++ b/OpenRA.Mods.Cnc/FileSystem/MixFile.cs
@@ -48,7 +48,7 @@ namespace OpenRA.Mods.Cnc.FileSystem
 
 					List<PackageEntry> entries;
 					if (isEncrypted)
-						entries = ParseHeader(DecryptHeader(s, 4, out dataStart), 0, out var unused);
+						entries = ParseHeader(DecryptHeader(s, 4, out dataStart), 0, out _);
 					else
 						entries = ParseHeader(s, isCncMix ? 0 : 4, out dataStart);
 
diff --git a/OpenRA.Mods.Common/ColorValidator.cs b/OpenRA.Mods.Common/ColorValidator.cs
index 407e2c794a..3dd2cd3a09 100644
--- a/OpenRA.Mods.Common/ColorValidator.cs
+++ b/OpenRA.Mods.Common/ColorValidator.cs
@@ -57,7 +57,7 @@ namespace OpenRA.Mods.Common
 		public bool IsValid(Color askedColor, out Color forbiddenColor, IEnumerable<Color> terrainColors, IEnumerable<Color> playerColors, HashSet<string> errorMessages = null)
 		{
 			// Validate color against HSV
-			askedColor.ToAhsv(out var a, out var h, out var s, out var v);
+			askedColor.ToAhsv(out _, out _, out var s, out var v);
 			if (s < HsvSaturationRange[0] || s > HsvSaturationRange[1] || v < HsvValueRange[0] || v > HsvValueRange[1])
 			{
 				if (errorMessages != null)
@@ -93,7 +93,7 @@ namespace OpenRA.Mods.Common
 			if (TeamColorPresets.Any())
 			{
 				foreach (var c in TeamColorPresets.Shuffle(random))
-					if (IsValid(c, out var forbidden, terrainColors, playerColors))
+					if (IsValid(c, out _, terrainColors, playerColors))
 						return c;
 			}
 
@@ -110,7 +110,7 @@ namespace OpenRA.Mods.Common
 				var v = float2.Lerp(HsvValueRange[0], HsvValueRange[1], random.NextFloat());
 				color = Color.FromAhsv(h, s, v);
 			}
-			while (!IsValid(color, out var forbidden, terrainColors, playerColors));
+			while (!IsValid(color, out _, terrainColors, playerColors));
 
 			return color;
 		}
diff --git a/OpenRA.Mods.Common/Traits/Attack/AttackFollow.cs b/OpenRA.Mods.Common/Traits/Attack/AttackFollow.cs
index b760012e78..bbffb2a822 100644
--- a/OpenRA.Mods.Common/Traits/Attack/AttackFollow.cs
+++ b/OpenRA.Mods.Common/Traits/Attack/AttackFollow.cs
@@ -108,7 +108,7 @@ namespace OpenRA.Mods.Common.Traits
 				// requestedTargetPresetForActivity will be cleared once the activity starts running and calls UpdateRequestedTarget
 				if (self.CurrentActivity != null && self.CurrentActivity.NextActivity == requestedTargetPresetForActivity)
 				{
-					RequestedTarget = RequestedTarget.Recalculate(self.Owner, out var targetIsHiddenActor);
+					RequestedTarget = RequestedTarget.Recalculate(self.Owner, out _);
 				}
 
 				// Requested activity has been canceled
diff --git a/OpenRA.Mods.Common/Traits/BotModules/Squads/States/AirStates.cs b/OpenRA.Mods.Common/Traits/BotModules/Squads/States/AirStates.cs
index c7caf40d89..d7c9eedd1f 100644
--- a/OpenRA.Mods.Common/Traits/BotModules/Squads/States/AirStates.cs
+++ b/OpenRA.Mods.Common/Traits/BotModules/Squads/States/AirStates.cs
@@ -85,7 +85,7 @@ namespace OpenRA.Mods.Common.Traits.BotModules.Squads
 
 		protected static bool NearToPosSafely(Squad owner, WPos loc)
 		{
-			return NearToPosSafely(owner, loc, out var a);
+			return NearToPosSafely(owner, loc, out _);
 		}
 
 		protected static bool NearToPosSafely(Squad owner, WPos loc, out Actor detectedEnemyTarget)
diff --git a/OpenRA.Mods.Common/UtilityCommands/ConvertSpriteToPngCommand.cs b/OpenRA.Mods.Common/UtilityCommands/ConvertSpriteToPngCommand.cs
index 51ce9afd08..96d93da491 100644
--- a/OpenRA.Mods.Common/UtilityCommands/ConvertSpriteToPngCommand.cs
+++ b/OpenRA.Mods.Common/UtilityCommands/ConvertSpriteToPngCommand.cs
@@ -49,7 +49,7 @@ namespace OpenRA.Mods.Common.UtilityCommands
 			for (var i = 0; i < Palette.Size; i++)
 				palColors[i] = palette.GetColor(i);
 
-			var frames = FrameLoader.GetFrames(File.OpenRead(src), modData.SpriteLoaders, out var metadata);
+			var frames = FrameLoader.GetFrames(File.OpenRead(src), modData.SpriteLoaders, out _);
 
 			var usePadding = !args.Contains("--nopadding");
 			var count = 0;
diff --git a/OpenRA.Mods.Common/UtilityCommands/Rgba2Hex.cs b/OpenRA.Mods.Common/UtilityCommands/Rgba2Hex.cs
index ef0de63987..9a79ad6573 100644
--- a/OpenRA.Mods.Common/UtilityCommands/Rgba2Hex.cs
+++ b/OpenRA.Mods.Common/UtilityCommands/Rgba2Hex.cs
@@ -37,7 +37,7 @@ namespace OpenRA.Mods.Common.UtilityCommands
 				{
 					foreach (var part in parts)
 					{
-						if (!byte.TryParse(part, out var component))
+						if (!byte.TryParse(part, out _))
 						{
 							invalid = true;
 							Console.WriteLine("Invalid component in color (argument " + i + "): [" + part + "]: " + args[i]);
@@ -125,7 +125,7 @@ namespace OpenRA.Mods.Common.UtilityCommands
 				{
 					foreach (var part in parts)
 					{
-						if (!byte.TryParse(part, out var component))
+						if (!byte.TryParse(part, out _))
 						{
 							invalid = true;
 							Console.WriteLine("Invalid component in color (argument " + i + "): [" + part + "]: " + args[i]);
diff --git a/OpenRA.Mods.Common/Widgets/ColorMixerWidget.cs b/OpenRA.Mods.Common/Widgets/ColorMixerWidget.cs
index bcb609e66a..fa965d35f9 100644
--- a/OpenRA.Mods.Common/Widgets/ColorMixerWidget.cs
+++ b/OpenRA.Mods.Common/Widgets/ColorMixerWidget.cs
@@ -235,7 +235,7 @@ namespace OpenRA.Mods.Common.Widgets
 
 		public void Set(Color color)
 		{
-			color.ToAhsv(out var a, out var h, out var s, out var v);
+			color.ToAhsv(out _, out var h, out var s, out var v);
 
 			if (H != h || S != s || V != v)
 			{
diff --git a/OpenRA.Mods.Common/Widgets/Logic/ColorPickerLogic.cs b/OpenRA.Mods.Common/Widgets/Logic/ColorPickerLogic.cs
index 88aa6dc1d7..a8792e669b 100644
--- a/OpenRA.Mods.Common/Widgets/Logic/ColorPickerLogic.cs
+++ b/OpenRA.Mods.Common/Widgets/Logic/ColorPickerLogic.cs
@@ -187,7 +187,7 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 
 		static float HueFromColor(Color c)
 		{
-			c.ToAhsv(out var a, out var h, out var s, out var v);
+			c.ToAhsv(out _, out var h, out _, out _);
 			return h;
 		}
 
diff --git a/OpenRA.Platforms.Default/Sdl2PlatformWindow.cs b/OpenRA.Platforms.Default/Sdl2PlatformWindow.cs
index cc653d9674..46e8db6121 100644
--- a/OpenRA.Platforms.Default/Sdl2PlatformWindow.cs
+++ b/OpenRA.Platforms.Default/Sdl2PlatformWindow.cs
@@ -174,7 +174,7 @@ namespace OpenRA.Platforms.Default
 				// This is not necessary on macOS, which defines window sizes in effective units ("points").
 				if (Platform.CurrentPlatform == PlatformType.Windows)
 				{
-					if (SDL.SDL_GetDisplayDPI(videoDisplay, out var ddpi, out var hdpi, out var vdpi) == 0)
+					if (SDL.SDL_GetDisplayDPI(videoDisplay, out var ddpi, out _, out _) == 0)
 						windowScale = ddpi / 96;
 				}
 				else if (Platform.CurrentPlatform != PlatformType.OSX)
diff --git a/OpenRA.Platforms.Default/Shader.cs b/OpenRA.Platforms.Default/Shader.cs
index 55ec199fd8..1ae7dd9b67 100644
--- a/OpenRA.Platforms.Default/Shader.cs
+++ b/OpenRA.Platforms.Default/Shader.cs
@@ -57,7 +57,7 @@ namespace OpenRA.Platforms.Default
 			{
 				OpenGL.glGetShaderiv(shader, OpenGL.GL_INFO_LOG_LENGTH, out var len);
 				var log = new StringBuilder(len);
-				OpenGL.glGetShaderInfoLog(shader, len, out var length, log);
+				OpenGL.glGetShaderInfoLog(shader, len, out _, log);
 
 				Log.Write("graphics", "GL Info Log:\n{0}", log.ToString());
 				throw new InvalidProgramException("Compile error in shader object '{0}'".F(filename));
@@ -104,7 +104,7 @@ namespace OpenRA.Platforms.Default
 				OpenGL.glGetProgramiv(program, OpenGL.GL_INFO_LOG_LENGTH, out var len);
 
 				var log = new StringBuilder(len);
-				OpenGL.glGetProgramInfoLog(program, len, out var length, log);
+				OpenGL.glGetProgramInfoLog(program, len, out _, log);
 				Log.Write("graphics", "GL Info Log:\n{0}", log.ToString());
 				throw new InvalidProgramException("Link error in shader program '{0}'".F(name));
 			}
@@ -120,7 +120,7 @@ namespace OpenRA.Platforms.Default
 			for (var i = 0; i < numUniforms; i++)
 			{
 				var sb = new StringBuilder(128);
-				OpenGL.glGetActiveUniform(program, i, 128, out var length, out var size, out var type, sb);
+				OpenGL.glGetActiveUniform(program, i, 128, out _, out _, out var type, sb);
 				var sampler = sb.ToString();
 				OpenGL.CheckGLError();