diff --git a/src/Compilers/VisualBasic/Portable/Binding/Binder_Invocation.vb b/src/Compilers/VisualBasic/Portable/Binding/Binder_Invocation.vb
index 8a9d8fe0d3ca6..be3502a79105f 100644
--- a/src/Compilers/VisualBasic/Portable/Binding/Binder_Invocation.vb
+++ b/src/Compilers/VisualBasic/Portable/Binding/Binder_Invocation.vb
@@ -3126,11 +3126,6 @@ ProduceBoundNode:
 
                     Dim isCallerArgumentExpression = callerArgumentExpressionParameterIndex > -1 OrElse (reducedExtensionReceiverOpt IsNot Nothing AndAlso callerArgumentExpressionParameterIndex > -2)
 
-                    If isCallerArgumentExpression AndAlso Not SyntaxTree.Options.Features.ContainsKey(InternalSyntax.GetFeatureFlag(InternalSyntax.Feature.CallerArgumentExpression)) Then
-                        ' Silently require feature flag for this feature until Aleksey approves.
-                        isCallerArgumentExpression = False
-                    End If
-
                     If isCallerLineNumber OrElse isCallerMemberName OrElse isCallerFilePath OrElse isCallerArgumentExpression Then
                         Dim callerInfoValue As ConstantValue = Nothing
 
diff --git a/src/Compilers/VisualBasic/Portable/Parser/ParserFeature.vb b/src/Compilers/VisualBasic/Portable/Parser/ParserFeature.vb
index 0d9f7e1feed76..71a47e3f057fd 100644
--- a/src/Compilers/VisualBasic/Portable/Parser/ParserFeature.vb
+++ b/src/Compilers/VisualBasic/Portable/Parser/ParserFeature.vb
@@ -41,15 +41,12 @@ Namespace Microsoft.CodeAnalysis.VisualBasic.Syntax.InternalSyntax
         UnconstrainedTypeParameterInConditional
         CommentsAfterLineContinuation
         InitOnlySettersUsage
-        CallerArgumentExpression
     End Enum
 
     Friend Module FeatureExtensions
         <Extension>
         Friend Function GetFeatureFlag(feature As Feature) As String
             Select Case feature
-                Case Feature.CallerArgumentExpression
-                    Return NameOf(Feature.CallerArgumentExpression)
                 Case Else
                     Return Nothing
             End Select
@@ -181,8 +178,6 @@ Namespace Microsoft.CodeAnalysis.VisualBasic.Syntax.InternalSyntax
                     Return ERRID.FEATURE_CommentsAfterLineContinuation
                 Case Feature.InitOnlySettersUsage
                     Return ERRID.FEATURE_InitOnlySettersUsage
-                Case Feature.CallerArgumentExpression
-                    Return ERRID.FEATURE_CallerArgumentExpression
                 Case Else
                     Throw ExceptionUtilities.UnexpectedValue(feature)
             End Select
diff --git a/src/Compilers/VisualBasic/Portable/Symbols/Source/SourceComplexParameterSymbol.vb b/src/Compilers/VisualBasic/Portable/Symbols/Source/SourceComplexParameterSymbol.vb
index 5a6dd49be6b9d..ac6b3a6095f6b 100644
--- a/src/Compilers/VisualBasic/Portable/Symbols/Source/SourceComplexParameterSymbol.vb
+++ b/src/Compilers/VisualBasic/Portable/Symbols/Source/SourceComplexParameterSymbol.vb
@@ -249,11 +249,6 @@ Namespace Microsoft.CodeAnalysis.VisualBasic.Symbols
 
         Friend Overrides ReadOnly Property CallerArgumentExpressionParameterIndex As Integer
             Get
-                If Not _syntaxRef.SyntaxTree.Options.Features.ContainsKey(InternalSyntax.GetFeatureFlag(InternalSyntax.Feature.CallerArgumentExpression)) Then
-                    ' Silently require feature flag for this feature until Aleksey approves.
-                    Return -1
-                End If
-
                 Dim attributeSource As SourceParameterSymbol = If(Me.BoundAttributesSource, Me)
 
                 Dim data = attributeSource.GetEarlyDecodedWellKnownAttributeData()
diff --git a/src/Compilers/VisualBasic/Portable/Symbols/Source/SourceParameterSymbol.vb b/src/Compilers/VisualBasic/Portable/Symbols/Source/SourceParameterSymbol.vb
index 5ca15b5542e78..313c892c02ba3 100644
--- a/src/Compilers/VisualBasic/Portable/Symbols/Source/SourceParameterSymbol.vb
+++ b/src/Compilers/VisualBasic/Portable/Symbols/Source/SourceParameterSymbol.vb
@@ -242,8 +242,7 @@ Namespace Microsoft.CodeAnalysis.VisualBasic.Symbols
                 arguments.GetOrCreateData(Of ParameterEarlyWellKnownAttributeData).HasCallerFilePathAttribute = True
             ElseIf VisualBasicAttributeData.IsTargetEarlyAttribute(arguments.AttributeType, arguments.AttributeSyntax, AttributeDescription.CallerMemberNameAttribute) Then
                 arguments.GetOrCreateData(Of ParameterEarlyWellKnownAttributeData).HasCallerMemberNameAttribute = True
-            ElseIf VisualBasicAttributeData.IsTargetEarlyAttribute(arguments.AttributeType, arguments.AttributeSyntax, AttributeDescription.CallerArgumentExpressionAttribute) AndAlso
-                Location.SourceTree.Options.Features.ContainsKey(InternalSyntax.GetFeatureFlag(InternalSyntax.Feature.CallerArgumentExpression)) Then
+            ElseIf VisualBasicAttributeData.IsTargetEarlyAttribute(arguments.AttributeType, arguments.AttributeSyntax, AttributeDescription.CallerArgumentExpressionAttribute) Then
                 Dim index = -1
                 Dim attribute = arguments.Binder.GetAttribute(arguments.AttributeSyntax, arguments.AttributeType, False)
                 If Not attribute.HasErrors Then
@@ -268,15 +267,6 @@ Namespace Microsoft.CodeAnalysis.VisualBasic.Symbols
         Friend Overrides Iterator Function GetCustomAttributesToEmit(compilationState As ModuleCompilationState) As IEnumerable(Of VisualBasicAttributeData)
             Dim attributes = MyBase.GetCustomAttributesToEmit(compilationState)
 
-            If Location Is Nothing OrElse Not Location.IsInSource OrElse
-                Not Location.SourceTree.Options.Features.ContainsKey(InternalSyntax.GetFeatureFlag(InternalSyntax.Feature.CallerArgumentExpression)) Then
-                ' Silently require feature flag for this feature until Aleksey approves.
-                For Each attribute In attributes
-                    Yield attribute
-                Next
-                Return
-            End If
-
             For Each attribute In attributes
                 If AttributeData.IsTargetEarlyAttribute(attributeType:=attribute.AttributeClass, attributeArgCount:=attribute.CommonConstructorArguments.Length, description:=AttributeDescription.CallerArgumentExpressionAttribute) Then
                     Dim callerArgumentExpressionParameterIndex = Me.CallerArgumentExpressionParameterIndex
@@ -368,8 +358,7 @@ Namespace Microsoft.CodeAnalysis.VisualBasic.Symbols
                 arguments.GetOrCreateData(Of CommonParameterWellKnownAttributeData)().HasOutAttribute = True
             ElseIf attrData.IsTargetAttribute(Me, AttributeDescription.MarshalAsAttribute) Then
                 MarshalAsAttributeDecoder(Of CommonParameterWellKnownAttributeData, AttributeSyntax, VisualBasicAttributeData, AttributeLocation).Decode(arguments, AttributeTargets.Parameter, MessageProvider.Instance)
-            ElseIf attrData.IsTargetAttribute(Me, AttributeDescription.CallerArgumentExpressionAttribute) AndAlso
-                Location.SourceTree.Options.Features.ContainsKey(InternalSyntax.GetFeatureFlag(InternalSyntax.Feature.CallerArgumentExpression)) Then
+            ElseIf attrData.IsTargetAttribute(Me, AttributeDescription.CallerArgumentExpressionAttribute) Then
                 Dim index = GetEarlyDecodedWellKnownAttributeData()?.CallerArgumentExpressionParameterIndex
                 If index = Ordinal Then
                     DirectCast(arguments.Diagnostics, BindingDiagnosticBag).Add(ERRID.WRN_CallerArgumentExpressionAttributeSelfReferential, arguments.AttributeSyntaxOpt.Location, Me.Name)
diff --git a/src/Compilers/VisualBasic/Portable/Symbols/Source/SourceSimpleParameterSymbol.vb b/src/Compilers/VisualBasic/Portable/Symbols/Source/SourceSimpleParameterSymbol.vb
index 0aaa227521dfd..253708a7046f6 100644
--- a/src/Compilers/VisualBasic/Portable/Symbols/Source/SourceSimpleParameterSymbol.vb
+++ b/src/Compilers/VisualBasic/Portable/Symbols/Source/SourceSimpleParameterSymbol.vb
@@ -131,10 +131,6 @@ Namespace Microsoft.CodeAnalysis.VisualBasic.Symbols
 
         Friend Overrides ReadOnly Property CallerArgumentExpressionParameterIndex As Integer
             Get
-                If Not Location.SourceTree.Options.Features.ContainsKey(InternalSyntax.GetFeatureFlag(InternalSyntax.Feature.CallerArgumentExpression)) Then
-                    ' Silently require feature flag for this feature until Aleksey approves.
-                    Return -1
-                End If
                 Dim data = GetEarlyDecodedWellKnownAttributeData()
                 If data Is Nothing Then
                     Return -1
diff --git a/src/Compilers/VisualBasic/Test/Emit/Attributes/AttributeTests_CallerArgumentExpression.vb b/src/Compilers/VisualBasic/Test/Emit/Attributes/AttributeTests_CallerArgumentExpression.vb
index 7ed9f77ddfded..93a1b681ac714 100644
--- a/src/Compilers/VisualBasic/Test/Emit/Attributes/AttributeTests_CallerArgumentExpression.vb
+++ b/src/Compilers/VisualBasic/Test/Emit/Attributes/AttributeTests_CallerArgumentExpression.vb
@@ -30,12 +30,12 @@ Module Program
 End Module
 "
 
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="123").VerifyDiagnostics()
         End Sub
 
         <ConditionalFact(GetType(CoreClrOnly))>
-        Public Sub TestGoodCallerArgumentExpressionAttribute_OldVersionWithFeatureFlag()
+        Public Sub TestGoodCallerArgumentExpressionAttribute_OldVersion()
             Dim source As String = "
 Imports System
 Imports System.Runtime.CompilerServices
@@ -51,7 +51,7 @@ Module Program
 End Module
 "
 
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.Regular16.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.Regular16)
             CompileAndVerify(compilation, expectedOutput:="123").VerifyDiagnostics()
         End Sub
 
@@ -88,7 +88,7 @@ Class Program
 End Class
 "
 
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="456").VerifyDiagnostics()
         End Sub
 
@@ -125,7 +125,7 @@ Class Program
 End Class
 "
 
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="<default-arg>").VerifyDiagnostics()
         End Sub
 
@@ -146,7 +146,7 @@ Public Module Program2
 End Module
 "
 
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="123").VerifyDiagnostics().VerifyTypeIL("Program2", "
 .class public auto ansi sealed Program2
 	extends [System.Runtime]System.Object
@@ -254,31 +254,10 @@ End Module
         </file>
     </compilation>
 
-            Dim compilation = CreateCompilationWithCustomILSource(source, il, options:=TestOptions.ReleaseExe, includeVbRuntime:=True, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilationWithCustomILSource(source, il, options:=TestOptions.ReleaseExe, includeVbRuntime:=True, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="0 + 1").VerifyDiagnostics()
         End Sub
 
-        <ConditionalFact(GetType(CoreClrOnly))>
-        Public Sub TestGoodCallerArgumentExpressionAttribute_Version16_9_WithoutFeatureFlag()
-            Dim source As String = "
-Imports System
-Imports System.Runtime.CompilerServices
-Module Program
-    Sub Main()
-        Log(123)
-    End Sub
-
-    Private Const p As String = NameOf(p)
-    Sub Log(p As Integer, <CallerArgumentExpression(p)> Optional arg As String = ""<default-arg>"")
-        Console.WriteLine(arg)
-    End Sub
-End Module
-"
-
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.Regular16_9)
-            CompileAndVerify(compilation, expectedOutput:="<default-arg>").VerifyDiagnostics()
-        End Sub
-
         <ConditionalFact(GetType(CoreClrOnly))>
         Public Sub TestGoodCallerArgumentExpressionAttribute_ExpressionHasTrivia()
             Dim source = "
@@ -299,7 +278,7 @@ Module Program
 End Module
 "
 
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="123  + _
                5").VerifyDiagnostics()
         End Sub
@@ -321,7 +300,7 @@ Module Program
 End Module
 "
 
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="124, 123, 124").VerifyDiagnostics()
         End Sub
 
@@ -350,7 +329,7 @@ Module Program
 End Module
 "
 
-            Dim compilation = CreateCompilation(source2, references:={ref1, Net451.MicrosoftVisualBasic}, targetFramework:=TargetFramework.NetCoreApp, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source2, references:={ref1, Net451.MicrosoftVisualBasic}, targetFramework:=TargetFramework.NetCoreApp, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="2 + 2").VerifyDiagnostics()
         End Sub
 
@@ -373,7 +352,7 @@ Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="myIntegerExpression").VerifyDiagnostics()
         End Sub
 
@@ -396,7 +375,7 @@ Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="myIntegerExpression * 2").VerifyDiagnostics()
         End Sub
 
@@ -419,7 +398,7 @@ Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="<default-arg>")
             compilation.AssertTheseDiagnostics(
 <expected><![CDATA[
@@ -446,7 +425,7 @@ Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.Regular16_9.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.Regular16_9)
             CompileAndVerify(compilation, expectedOutput:="<default>")
             compilation.AssertTheseDiagnostics(
 <expected><![CDATA[
@@ -494,7 +473,7 @@ Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="Main").VerifyDiagnostics()
         End Sub
 
@@ -536,7 +515,7 @@ Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(Parse(source, "C:\\Program.cs", options:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression")), targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe)
+            Dim compilation = CreateCompilation(Parse(source, "C:\\Program.cs", options:=TestOptions.RegularLatest), targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe)
             CompileAndVerify(compilation, expectedOutput:="C:\\Program.cs").VerifyDiagnostics()
         End Sub
 
@@ -578,7 +557,7 @@ Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="6").VerifyDiagnostics()
         End Sub
 
@@ -620,7 +599,7 @@ Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="6").VerifyDiagnostics()
         End Sub
 
@@ -641,7 +620,7 @@ Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             compilation.AssertTheseDiagnostics(
 <expected><![CDATA[
 BC30455: Argument not specified for parameter 'arg' of 'Public Sub Log(p As Integer, arg As String)'.
@@ -711,7 +690,7 @@ Class Program
     End Sub
 End Class
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="5 + 4
 default
 default
@@ -747,7 +726,7 @@ Class Program
     End Sub
 End Class
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="True").VerifyDiagnostics()
         End Sub
 
@@ -771,7 +750,7 @@ Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="target default value
 arg default value
 caller target value
@@ -801,7 +780,7 @@ Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="target default value
 arg default value
 caller target value
@@ -834,7 +813,7 @@ Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="param1: param1_default, param2: param2_default
 param1: param1_value, param2: ""param1_value""
 param1: param1_value, param2: ""param1_value""
@@ -859,7 +838,7 @@ Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="Main
 <default-arg-expression>").VerifyDiagnostics()
         End Sub
@@ -880,7 +859,7 @@ Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="<default>
 value")
             compilation.AssertTheseDiagnostics(
@@ -936,7 +915,7 @@ End Module
         </file>
     </compilation>
 
-            Dim compilation = CreateCompilationWithCustomILSource(source, il, options:=TestOptions.ReleaseExe, includeVbRuntime:=True, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilationWithCustomILSource(source, il, options:=TestOptions.ReleaseExe, includeVbRuntime:=True, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="<default>
 value").VerifyDiagnostics()
         End Sub
@@ -963,7 +942,7 @@ Public Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="123").VerifyDiagnostics()
         End Sub
 
@@ -989,7 +968,7 @@ Public Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="123 _ ' comment
     + 5").VerifyDiagnostics()
         End Sub
@@ -1020,7 +999,7 @@ Public Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source2, references:={ref1, Net451.MicrosoftVisualBasic}, targetFramework:=TargetFramework.NetCoreApp, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source2, references:={ref1, Net451.MicrosoftVisualBasic}, targetFramework:=TargetFramework.NetCoreApp, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="2 + 2").VerifyDiagnostics()
         End Sub
 
@@ -1044,7 +1023,7 @@ Public Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="<default-arg>")
             compilation.AssertTheseDiagnostics(
 <expected><![CDATA[
@@ -1079,7 +1058,7 @@ Public Module Program
 End Module
 "
 
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="target default value
 arg default value
 caller target value
@@ -1110,7 +1089,7 @@ Public Module Program
 End Module
 "
 
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="default
 value")
             compilation.AssertTheseDiagnostics(
@@ -1147,7 +1126,7 @@ Public Module Program
 End Module
 "
 
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="'<default1>', '<default0>'").VerifyDiagnostics()
         End Sub
 #End Region
@@ -1178,7 +1157,7 @@ Class Program
     End Sub
 End Class
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="2, 1+  1
 4, explicit-value").VerifyDiagnostics()
         End Sub
@@ -1203,7 +1182,7 @@ Class Program
     End Sub
 End Class
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation).VerifyDiagnostics().VerifyIL("Program.Main", "
 {
   // Code size       27 (0x1b)
@@ -1242,7 +1221,7 @@ Class Program
     End Sub
 End Class
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             compilation.AssertTheseDiagnostics(
 <expected><![CDATA[
 BC33010: 'Delegate' parameters cannot be declared 'Optional'.
@@ -1325,7 +1304,7 @@ Public Class ComClass1
     End Sub
 End Class
 "
-            Dim comp1 = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseDll, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim comp1 = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseDll, parseOptions:=TestOptions.RegularLatest)
             comp1.VerifyDiagnostics()
 
             Dim source2 = "
@@ -1336,7 +1315,7 @@ Module Program
     End Sub
 End Module
 "
-            Dim comp2 = CreateCompilation(source2, references:={comp1.EmitToImageReference()}, TestOptions.ReleaseExe, TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim comp2 = CreateCompilation(source2, references:={comp1.EmitToImageReference()}, TestOptions.ReleaseExe, TestOptions.RegularLatest)
             CompileAndVerify(comp2, expectedOutput:="1 + 2").VerifyDiagnostics()
         End Sub
 
@@ -1390,7 +1369,7 @@ Module Program
     End Sub
 End Module
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="1 + 2").VerifyDiagnostics()
         End Sub
 
@@ -1458,7 +1437,7 @@ End Module
         </file>
     </compilation>
 
-            Dim compilation = CreateCompilationWithCustomILSource(source, il, options:=TestOptions.ReleaseExe, includeVbRuntime:=True, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilationWithCustomILSource(source, il, options:=TestOptions.ReleaseExe, includeVbRuntime:=True, parseOptions:=TestOptions.RegularLatest)
             compilation.VerifyDiagnostics()
         End Sub
 
@@ -1484,7 +1463,7 @@ Class Program
     End Sub
 End Class
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="New value")
             compilation.AssertTheseDiagnostics(
 <expected><![CDATA[
@@ -1516,7 +1495,7 @@ Class Program
     End Sub
 End Class
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="New value")
             compilation.AssertTheseDiagnostics(
 <expected><![CDATA[
@@ -1548,7 +1527,7 @@ Class Program
     End Sub
 End Class
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             compilation.AssertTheseDiagnostics(
 <expected><![CDATA[
 BC42505: The CallerArgumentExpressionAttribute applied to parameter 'value' will have no effect. It is applied with an invalid parameter name.
@@ -1582,7 +1561,7 @@ Class Program
     End Sub
 End Class
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             compilation.AssertTheseDiagnostics(
 <expected><![CDATA[
 BC42504: The CallerArgumentExpressionAttribute applied to parameter 'value' will have no effect because it's self-referential.
@@ -1616,7 +1595,7 @@ Class Program
     End Sub
 End Class
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             compilation.AssertTheseDiagnostics(
 <expected><![CDATA[
 BC31065: 'Set' parameter cannot be declared 'Optional'.
@@ -1647,7 +1626,7 @@ Class Program
     End Sub
 End Class
 "
-            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest.WithFeature("CallerArgumentExpression"))
+            Dim compilation = CreateCompilation(source, targetFramework:=TargetFramework.NetCoreApp, references:={Net451.MicrosoftVisualBasic}, options:=TestOptions.ReleaseExe, parseOptions:=TestOptions.RegularLatest)
             CompileAndVerify(compilation, expectedOutput:="New value").VerifyDiagnostics()
         End Sub
 #End Region