Fixing IsConstantExpressionContext inside CasePatternSwitchLabel

src/EditorFeatures/CSharpTest/Completion/CompletionProviders/SymbolCompletionProviderTests.cs

@@ -1263,9 +1263,15 @@ public async Task SwitchStatement()
         [Fact, Trait(Traits.Feature, Traits.Features.Completion)]
         public async Task SwitchLabelCase()
         {
-            var content = @"switch(i)
-    {
-        case $$";
+            var content = @"switch(i) { case $$";
+            await VerifyItemExistsAsync(AddUsingDirectives("using System;", AddInsideMethod(content)), @"String");
+            await VerifyItemExistsAsync(AddUsingDirectives("using System;", AddInsideMethod(content)), @"System");
+        }
+
+        [Fact, Trait(Traits.Feature, Traits.Features.Completion)]
+        public async Task SwitchPatternLabelCase()
+        {
+            var content = @"switch(i) { case $$ when";
             await VerifyItemExistsAsync(AddUsingDirectives("using System;", AddInsideMethod(content)), @"String");
             await VerifyItemExistsAsync(AddUsingDirectives("using System;", AddInsideMethod(content)), @"System");
         }
@@ -2701,6 +2707,24 @@ void M()
             await VerifyItemExistsAsync(markup, "MAX_SIZE");
         }
 
+        [WorkItem(25084, "https://github.com/dotnet/roslyn/issues/25084#issuecomment-370148553")]
+        [Fact, Trait(Traits.Feature, Traits.Features.Completion)]
+        public async Task ConstantsInSwitchPatternCase()
+        {
+            var markup = @"
+class C
+{
+    public const int MAX_SIZE = 10;
+    void M()
+    {
+        int i = 10;
+        switch (i)
+        {
+            case $$ when";
+
+            await VerifyItemExistsAsync(markup, "MAX_SIZE");
+        }
+
         [WorkItem(542429, "http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/542429")]
         [Fact, Trait(Traits.Feature, Traits.Features.Completion)]
         public async Task ConstantsInSwitchGotoCase()

src/Workspaces/CSharp/Portable/Extensions/ContextQuery/SyntaxTreeExtensions.cs

@@ -1802,7 +1802,7 @@ public static bool IsConstantExpressionContext(this SyntaxTree syntaxTree, int p
 
             // case |
             if (token.IsKind(SyntaxKind.CaseKeyword) &&
-                token.Parent.IsKind(SyntaxKind.CaseSwitchLabel))
+                token.Parent.IsKind(SyntaxKind.CaseSwitchLabel, SyntaxKind.CasePatternSwitchLabel))
             {
                 return true;
             }