removed most of the last commit (handling declarators) since they aren't...

removed most of the last commit (handling declarators) since they aren't discards from the compilers view. Kept the tests around and tweaked them so they now check that nothing is classified in these cases.

src/EditorFeatures/CSharpTest/Classification/SemanticClassifierTests.cs

@@ -3614,7 +3614,7 @@ void N()
         }
 
         [Fact, Trait(Traits.Feature, Traits.Features.Classification)]
-        public async Task DiscardVariableDeclaration()
+        public async Task NonDiscardVariableDeclaration()
         {
             await TestAsync(@"
 class X
@@ -3625,13 +3625,12 @@ void N()
     }
 }",
             Keyword("var"),
-            Keyword("_"),
-            Method("Parse"),
-            Static("Parse"));
+            Static("Parse"),
+            Method("Parse"));
         }
 
         [Fact, Trait(Traits.Feature, Traits.Features.Classification)]
-        public async Task DiscardVariableDeclarationMultipleDeclarators()
+        public async Task NonDiscardVariableDeclarationMultipleDeclarators()
         {
             await TestAsync(@"
 class X
@@ -3641,9 +3640,7 @@ void N()
         int i = 1, _ = 1;
         int _ = 2, j = 1;
     }
-}",
-            Keyword("_"),
-            Keyword("_"));
+}");
         }
 
         [Fact, Trait(Traits.Feature, Traits.Features.Classification)]

src/Workspaces/CSharp/Portable/Classification/SyntaxClassification/DiscardSyntaxClassifier.cs

@@ -18,7 +18,6 @@ internal class DiscardSyntaxClassifier : AbstractSyntaxClassifier
         public override ImmutableArray<Type> SyntaxNodeTypes { get; } = ImmutableArray.Create(
             typeof(DiscardDesignationSyntax),
             typeof(DiscardPatternSyntax),
-            typeof(VariableDeclaratorSyntax),
             typeof(ParameterSyntax),
             typeof(IdentifierNameSyntax));
 
@@ -37,10 +36,6 @@ internal class DiscardSyntaxClassifier : AbstractSyntaxClassifier
 
             switch (syntax)
             {
-                case VariableDeclaratorSyntax declarator when declarator.Identifier.Text == "_":
-                    result.Add(new ClassifiedSpan(declarator.Identifier.Span, ClassificationTypeNames.Keyword));
-                    break;
-
                 case ParameterSyntax parameter when parameter.Identifier.Text == "_":
                     var symbol = semanticModel.GetDeclaredSymbol(parameter, cancellationToken);