Use inline variables.

src/Workspaces/Core/Portable/FindSymbols/FindReferences/FindReferenceCache.cs

@@ -202,8 +202,7 @@ private static Entry GetCachedEntry(SemanticModel model)
         {
             using (s_gate.DisposableRead())
             {
-                Entry entry;
-                if (s_cache.TryGetValue(model, out entry))
+                if (s_cache.TryGetValue(model, out var entry))
                 {
                     return entry;
                 }
@@ -234,8 +233,7 @@ public static void Stop(SemanticModel model)
 
             using (s_gate.DisposableWrite())
             {
-                Entry entry;
-                if (!s_cache.TryGetValue(model, out entry))
+                if (!s_cache.TryGetValue(model, out var entry))
                 {
                     return;
                 }

src/Workspaces/Core/Portable/FindSymbols/FindReferences/FindReferencesSearchEngine_ProjectProcessing.cs

@@ -65,8 +65,7 @@ internal partial class FindReferencesSearchEngine
             Dictionary<Project, Dictionary<Document, List<(SymbolAndProjectId symbolAndProjectId, IReferenceFinder finder)>>> projectMap,
             ProgressWrapper wrapper)
         {
-            Dictionary<Document, List<(SymbolAndProjectId symbolAndProjectId, IReferenceFinder finder)>> map;
-            if (!projectMap.TryGetValue(project, out map))
+            if (!projectMap.TryGetValue(project, out var map))
             {
                 // No files in this project to process.  We can bail here.  We'll have cached our
                 // compilation if there are any projects left to process that depend on us.

src/Workspaces/Core/Portable/FindSymbols/FindReferences/Finders/OperatorSymbolReferenceFinder.cs

@@ -44,8 +44,7 @@ protected override bool CanFind(IMethodSymbol symbol)
             PredefinedOperator op,
             SyntaxToken token)
         {
-            PredefinedOperator actualOperator;
-            return syntaxFacts.TryGetPredefinedOperator(token, out actualOperator) && actualOperator == op;
+            return syntaxFacts.TryGetPredefinedOperator(token, out var actualOperator) && actualOperator == op;
         }
     }
 }

src/Workspaces/Core/Portable/FindSymbols/ReferenceLocationExtensions.cs

@@ -51,8 +51,7 @@ internal static class ReferenceLocationExtensions
                 var containingSymbol = GetEnclosingMethodOrPropertyOrField(semanticModel, reference);
                 if (containingSymbol != null)
                 {
-                    List<Location> locations;
-                    if (!result.TryGetValue(containingSymbol, out locations))
+                    if (!result.TryGetValue(containingSymbol, out var locations))
                     {
                         locations = new List<Location>();
                         result.Add(containingSymbol, locations);

src/Workspaces/Core/Portable/FindSymbols/SymbolFinder_Hierarchy.cs

@@ -356,8 +356,7 @@ public static async Task<IEnumerable<SymbolCallerInfo>> FindCallersAsync(ISymbol
                 return false;
             }
 
-            Compilation symbolToMatchCompilation = null;
-            if (!TryGetCompilation(symbolToMatch, solution, out symbolToMatchCompilation, cancellationToken))
+            if (!TryGetCompilation(symbolToMatch, solution, out var symbolToMatchCompilation, cancellationToken))
             {
                 return false;
             }