Use patterns in more places.

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

@@ -219,9 +219,8 @@ public static partial class SymbolFinder
             // A symbol can only have implementations if it's an interface or a
             // method/property/event from an interface.
             var symbol = symbolAndProjectId.Symbol;
-            if (symbol is INamedTypeSymbol)
+            if (symbol is INamedTypeSymbol namedTypeSymbol)
             {
-                var namedTypeSymbol = (INamedTypeSymbol)symbol;
                 var implementingTypes = await DependentTypeFinder.FindTransitivelyImplementingTypesAsync(namedTypeSymbol, solution, projects, cancellationToken).ConfigureAwait(false);
                 return implementingTypes.Select(s => (SymbolAndProjectId)s)
                                         .Where(IsAccessible)

src/Workspaces/Core/Portable/Formatting/Engine/TokenData.cs

@@ -59,12 +59,8 @@ public override int GetHashCode()
 
         public override bool Equals(object obj)
         {
-            if (obj is TokenData)
-            {
-                return this.Equals((TokenData)obj);
-            }
-
-            return false;
+            return obj is TokenData data &&
+                   this.Equals(data);
         }
 
         public bool Equals(TokenData other)