Use local functions

osu.Desktop/OsuGameDesktop.cs

@@ -45,7 +45,7 @@ namespace osu.Desktop
         {
             protected override string LocateBasePath()
             {
-                Func<string, bool> checkExists = p => Directory.Exists(Path.Combine(p, "Songs"));
+                bool checkExists(string p) => Directory.Exists(Path.Combine(p, "Songs"));
 
                 string stableInstallPath;
 

osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/DistanceObjectPatternGenerator.cs

@@ -321,7 +321,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
                     break;
             }
 
-            Func<SampleInfo, bool> isDoubleSample = sample => sample.Name == SampleInfo.HIT_CLAP && sample.Name == SampleInfo.HIT_FINISH;
+            bool isDoubleSample(SampleInfo sample) => sample.Name == SampleInfo.HIT_CLAP && sample.Name == SampleInfo.HIT_FINISH;
 
             bool canGenerateTwoNotes = (convertType & PatternType.LowProbability) == 0;
             canGenerateTwoNotes &= HitObject.Samples.Any(isDoubleSample) || sampleInfoListAt(HitObject.StartTime).Any(isDoubleSample);

osu.Game.Tests/Beatmaps/IO/ImportBeatmapTest.cs

@@ -117,8 +117,8 @@ namespace osu.Game.Tests.Beatmaps.IO
             //ensure we were stored to beatmap database backing...
             Assert.IsTrue(resultSets.Count() == 1, $@"Incorrect result count found ({resultSets.Count()} but should be 1).");
 
-            Func<IEnumerable<BeatmapInfo>> queryBeatmaps = () => store.QueryBeatmaps(s => s.BeatmapSet.OnlineBeatmapSetID == 241526 && s.BaseDifficultyID > 0);
+            IEnumerable<BeatmapInfo> queryBeatmaps() => store.QueryBeatmaps(s => s.BeatmapSet.OnlineBeatmapSetID == 241526 && s.BaseDifficultyID > 0);
-            Func<IEnumerable<BeatmapSetInfo>> queryBeatmapSets = () => store.QueryBeatmapSets(s => s.OnlineBeatmapSetID == 241526);
+            IEnumerable<BeatmapSetInfo> queryBeatmapSets() => store.QueryBeatmapSets(s => s.OnlineBeatmapSetID == 241526);
 
             //if we don't re-check here, the set will be inserted but the beatmaps won't be present yet.
             waitForOrAssert(() => queryBeatmaps().Count() == 12,

osu.Game.Tests/Visual/TestCasePlaySongSelect.cs

@@ -65,7 +65,7 @@ namespace osu.Game.Tests.Visual
             // this is by no means clean. should be replacing inside of OsuGameBase somehow.
             var context = new OsuDbContext();
 
-            Func<OsuDbContext> contextFactory = () => context;
+            OsuDbContext contextFactory() => context;
 
             dependencies.Cache(rulesets = new RulesetStore(contextFactory));
             dependencies.Cache(manager = new BeatmapManager(storage, contextFactory, rulesets, null)

osu.Game/Overlays/OnScreenDisplay.cs

@@ -121,7 +121,7 @@ namespace osu.Game.Overlays
             trackSetting(frameworkConfig.GetBindable<string>(FrameworkSetting.AudioDevice), v => display(v, "Audio Device", string.IsNullOrEmpty(v) ? "Default" : v, v));
             trackSetting(frameworkConfig.GetBindable<bool>(FrameworkSetting.ShowLogOverlay), v => display(v, "Debug Logs", v ? "visible" : "hidden", "Ctrl+F10"));
 
-            Action displayResolution = delegate { display(null, "Screen Resolution", frameworkConfig.Get<int>(FrameworkSetting.Width) + "x" + frameworkConfig.Get<int>(FrameworkSetting.Height)); };
+            void displayResolution() => display(null, "Screen Resolution", frameworkConfig.Get<int>(FrameworkSetting.Width) + "x" + frameworkConfig.Get<int>(FrameworkSetting.Height));
 
             trackSetting(frameworkConfig.GetBindable<int>(FrameworkSetting.Width), v => displayResolution());
             trackSetting(frameworkConfig.GetBindable<int>(FrameworkSetting.Height), v => displayResolution());

osu.Game/Overlays/Profile/ProfileHeader.cs

@@ -319,11 +319,11 @@ namespace osu.Game.Overlays.Profile
                 colourBar.Show();
             }
 
-            Action<SpriteText> boldItalic = t =>
+            void boldItalic(SpriteText t)
             {
                 t.Font = @"Exo2.0-BoldItalic";
                 t.Alpha = 1;
-            };
+            }
 
             if (user.Age != null)
             {

osu.Game/Screens/Menu/IntroSequence.cs

@@ -188,7 +188,7 @@ namespace osu.Game.Screens.Menu
             mediumRing.ResizeTo(130, 340, Easing.OutQuad);
             mediumRing.Foreground.ResizeTo(1, 880, Easing.Out);
 
-            Func<double> remainingTime = () => length - TransformDelay;
+            double remainingTime() => length - TransformDelay;
 
             using (BeginDelayedSequence(250, true))
             {

osu.Game/Screens/Menu/OsuLogo.cs

@@ -231,7 +231,7 @@ namespace osu.Game.Screens.Menu
         /// <param name="waitForPrevious">If true, the new animation is delayed until all previous transforms finish. If false, existing transformed are cleared.</param>
         public void AppendAnimatingAction(Action action, bool waitForPrevious)
         {
-            Action runnableAction = () =>
+            void runnableAction()
             {
                 if (waitForPrevious)
                     this.DelayUntilTransformsFinished().Schedule(action);
@@ -240,7 +240,7 @@ namespace osu.Game.Screens.Menu
                     ClearTransforms();
                     action();
                 }
-            };
+            }
 
             if (IsLoaded)
                 runnableAction();

osu.Game/Screens/Select/SongSelect.cs

@@ -266,7 +266,7 @@ namespace osu.Game.Screens.Select
         /// </summary>
         private void carouselSelectionChanged(BeatmapInfo beatmap)
         {
-            Action performLoad = delegate
+            void performLoad()
             {
                 // We may be arriving here due to another component changing the bindable Beatmap.
                 // In these cases, the other component has already loaded the beatmap, so we don't need to do so again.
@@ -279,7 +279,7 @@ namespace osu.Game.Screens.Select
                 }
 
                 UpdateBeatmap(Beatmap.Value);
-            };
+            }
 
             if (beatmap?.Equals(beatmapNoDebounce) == true)
                 return;

osu.Game/Screens/Tournament/Drawings.cs

@@ -265,7 +265,7 @@ namespace osu.Game.Screens.Tournament
 
         private void writeResults(string text)
         {
-            Action writeAction = () =>
+            void writeAction()
             {
                 try
                 {
@@ -280,9 +280,9 @@ namespace osu.Game.Screens.Tournament
                 {
                     Logger.Error(ex, "Failed to write results.");
                 }
-            };
+            }
 
-            writeOp = writeOp?.ContinueWith(t => { writeAction(); }) ?? Task.Run(writeAction);
+            writeOp = writeOp?.ContinueWith(t => { writeAction(); }) ?? Task.Run((Action)writeAction);
         }
 
         private void reloadTeams()