Revert "Implement data flow analysis for interpolated expressions."

This reverts commit 2037411c.

src/Compilers/VisualBasic/Portable/Analysis/FlowAnalysis/AbstractFlowPass.vb

@@ -2528,19 +2528,6 @@ lUnsplitAndFinish:
             Visit(node.Expression)
             Return Nothing
         End Function
-
-        Public Overrides Function VisitInterpolatedStringExpression(node As BoundInterpolatedStringExpression) As BoundNode
-            For Each item In node.Contents
-                Visit(item)
-            Next
-
-            Return Nothing
-        End Function
-
-        Public Overrides Function VisitInterpolation(node As BoundInterpolation) As BoundNode
-            Visit(node.Expression)
-            Return Nothing
-        End Function
 #End Region
 
     End Class

src/Compilers/VisualBasic/Test/Semantic/Semantics/InterpolatedStringTests.vb

@@ -1139,151 +1139,6 @@ BC30491: Expression does not produce a value.
 
         End Sub
 
-        <Fact>
-        Public Sub FlowAnalysis_Warning_InterpoledVariableUsedBeforeBeingAssigned()
-
-            Dim compilation = CreateCompilationWithMscorlibAndVBRuntimeAndReferences(
-<compilation>
-    <%= _formattableStringSource %>
-    <file name="a.vb">
-Imports System
-Imports System.Console
-
-Module Program
-    Sub Main()
-        Dim v As Object
-
-        Write($"{v}")
-    End Sub
-End Module
-    </file>
-</compilation>)
-
-            AssertTheseCompileDiagnostics(compilation,
-<expected>
-BC42104: Variable 'v' is used before it has been assigned a value. A null reference exception could result at runtime.
-        Write($"{v}")
-                 ~
-</expected>)
-
-        End Sub
-
-        <Fact>
-        Public Sub FlowAnalysis_InterpolatedLocalConstNotConsideredUnused()
-
-            Dim compilation = CreateCompilationWithMscorlibAndVBRuntimeAndReferences(
-<compilation>
-    <%= _formattableStringSource %>
-    <file name="a.vb">
-Imports System
-Imports System.Console
-
-Module Program
-    Sub Main()
-        Const v As Object = Nothing
-
-        Write($"{v}")
-    End Sub
-End Module
-    </file>
-</compilation>)
-
-            AssertNoDiagnostics(compilation)
-
-        End Sub
-
-        <Fact>
-        Public Sub FlowAnalysis_AnalyzeDataFlowReportsCorrectResultsForVariablesUsedInInterpolations()
-
-            Dim compilation = CreateCompilationWithMscorlibAndVBRuntimeAndReferences(
-<compilation>
-    <%= _formattableStringSource %>
-    <file name="a.vb">
-Imports System
-Imports System.Console
-
-Module Program
-    Sub Main()
-        Dim v As Object = Nothing
-
-        Write($"Expression {v} is not a value.")
-
-        WriteLine(v)
-    End Sub
-End Module
-    </file>
-</compilation>)
-
-            AssertNoDiagnostics(compilation)
-
-            Dim mainTree = Aggregate t In compilation.SyntaxTrees Where t.FilePath = "a.vb" Into [Single]()
-            Dim root = mainTree.GetRoot()
-            Dim sm = compilation.GetSemanticModel(mainTree)
-
-            Dim vSymbol = CType(sm.GetDeclaredSymbol(root.DescendantNodes().OfType(Of ModifiedIdentifierSyntax).Single()), ILocalSymbol)
-
-            Dim analysis = sm.AnalyzeDataFlow(root.DescendantNodes().OfType(Of ExpressionStatementSyntax).First())
-
-            Assert.True(analysis.Succeeded)
-            Assert.DoesNotContain(vSymbol, analysis.AlwaysAssigned)
-            Assert.DoesNotContain(vSymbol, analysis.Captured)
-            Assert.Contains(vSymbol, analysis.DataFlowsIn)
-            Assert.DoesNotContain(vSymbol, analysis.DataFlowsOut)
-            Assert.Contains(vSymbol, analysis.ReadInside)
-            Assert.Contains(vSymbol, analysis.ReadOutside)
-            Assert.DoesNotContain(vSymbol, analysis.UnsafeAddressTaken)
-            Assert.DoesNotContain(vSymbol, analysis.VariablesDeclared)
-            Assert.DoesNotContain(vSymbol, analysis.WrittenInside)
-            Assert.Contains(vSymbol, analysis.WrittenOutside)
-
-        End Sub
-
-        <Fact>
-        Public Sub FlowAnalysis_AnalyzeDataFlowReportsCorrectResultsForVariablesCapturedInInterpolations()
-
-            Dim compilation = CreateCompilationWithMscorlibAndVBRuntimeAndReferences(
-<compilation>
-    <%= _formattableStringSource %>
-    <file name="a.vb">
-Imports System
-Imports System.Console
-
-Module Program
-    Sub Main()
-        Dim v As Object = Nothing
-
-        Write($"Expression {(Function() v)()} is not a value.")
-
-        WriteLine(v)
-    End Sub
-End Module
-    </file>
-</compilation>)
-
-            AssertNoDiagnostics(compilation)
-
-            Dim mainTree = Aggregate t In compilation.SyntaxTrees Where t.FilePath = "a.vb" Into [Single]()
-            Dim root = mainTree.GetRoot()
-            Dim sm = compilation.GetSemanticModel(mainTree)
-
-            Dim vSymbol = CType(sm.GetDeclaredSymbol(root.DescendantNodes().OfType(Of ModifiedIdentifierSyntax).Single()), ILocalSymbol)
-
-            Dim analysis = sm.AnalyzeDataFlow(root.DescendantNodes().OfType(Of ExpressionStatementSyntax).First())
-
-            Assert.True(analysis.Succeeded)
-            Assert.DoesNotContain(vSymbol, analysis.AlwaysAssigned)
-            Assert.Contains(vSymbol, analysis.Captured)
-            Assert.Contains(vSymbol, analysis.DataFlowsIn)
-            Assert.DoesNotContain(vSymbol, analysis.DataFlowsOut)
-            Assert.Contains(vSymbol, analysis.ReadInside)
-            Assert.Contains(vSymbol, analysis.ReadOutside)
-            Assert.DoesNotContain(vSymbol, analysis.UnsafeAddressTaken)
-            Assert.DoesNotContain(vSymbol, analysis.VariablesDeclared)
-            Assert.DoesNotContain(vSymbol, analysis.WrittenInside)
-            Assert.Contains(vSymbol, analysis.WrittenOutside)
-
-        End Sub
-
         <Fact>
         Public Sub Lowering_MissingFormattableStringDoesntProduceErrorIfFactoryMethodReturnsTypeConvertableToIFormattable()
 

src/EditorFeatures/VisualBasicTest/CodeActions/ExtractMethod/ExtractMethodTests.vb

@@ -112,20 +112,6 @@ NewLines("Module M \n Sub Main() \n Dim x = 0 \n Do While [|x * x < 100|] \n x +
 NewLines("Module M \n Sub Main() \n Dim x = 0 \n Do While {|Rename:NewMethod|}(x) \n x += 1 \n Loop \n End Sub \n Private Function NewMethod(x As Integer) As Boolean \n Return x * x < 100 \n End Function \n End Module"))
         End Sub
 
-        <Fact, Trait(Traits.Feature, Traits.Features.CodeActionsExtractMethod)>
-        Public Sub TestInInterpolation1()
-            Test(
-NewLines("Module M \n Sub Main() \n Dim v As New Object \n [|System.Console.WriteLine($""{v}"")|] \n System.Console.WriteLine(v) \n End Sub \n End Module"),
-NewLines("Module M \n Sub Main() \n Dim v As New Object \n {|Rename:NewMethod|}(v) \n System.Console.WriteLine(v) \n End Sub \n Private Sub NewMethod(v As Object) \n System.Console.WriteLine($""{v}"") \n End Sub \n End Module"))
-        End Sub
-
-        <Fact, Trait(Traits.Feature, Traits.Features.CodeActionsExtractMethod)>
-        Public Sub TestInInterpolation2()
-            Test(
-NewLines("Module M \n Sub Main() \n Dim v As New Object \n System.Console.WriteLine([|$""{v}""|]) \n System.Console.WriteLine(v) \n End Sub \n End Module"),
-NewLines("Module M \n Sub Main() \n Dim v As New Object \n System.Console.WriteLine({|Rename:NewMethod|}(v)) \n System.Console.WriteLine(v) \n End Sub \n Private Function NewMethod(v As Object) As Object \n Return $""{v}"" \n End Function \n End Module"))
-        End Sub
-
         <WorkItem(545829)>
         <Fact, Trait(Traits.Feature, Traits.Features.CodeActionsExtractMethod)>
         Public Sub TestMissingOnImplicitMemberAccess()