Merge pull request #787 from amcasey/GH443

Suggest adding Microsoft.VisualBasic for ERR_MissingRuntimeHelper

src/ExpressionEvaluator/Core/Source/ExpressionCompiler/EvaluationContextBase.cs

@@ -17,6 +17,7 @@ internal abstract class EvaluationContextBase
         internal static readonly AssemblyIdentity SystemCoreIdentity = new AssemblyIdentity("System.Core");
         internal static readonly AssemblyIdentity SystemXmlIdentity = new AssemblyIdentity("System.Xml");
         internal static readonly AssemblyIdentity SystemXmlLinqIdentity = new AssemblyIdentity("System.Xml.Linq");
+        internal static readonly AssemblyIdentity MicrosoftVisualBasicIdentity = new AssemblyIdentity("Microsoft.VisualBasic");
 
         /// <summary>
         /// Compile C# expression and emit assembly with evaluation method.

src/ExpressionEvaluator/VisualBasic/Source/ExpressionCompiler/EvaluationContext.vb

@@ -586,6 +586,8 @@ Namespace Microsoft.CodeAnalysis.VisualBasic.ExpressionEvaluator
                     End If
                 Case ERRID.ERR_XmlFeaturesNotAvailable
                     Return ImmutableArray.Create(SystemIdentity, SystemCoreIdentity, SystemXmlIdentity, SystemXmlLinqIdentity)
+                Case ERRID.ERR_MissingRuntimeHelper
+                    Return ImmutableArray.Create(MicrosoftVisualBasicIdentity)
             End Select
 
             Return Nothing

src/ExpressionEvaluator/VisualBasic/Test/ExpressionCompiler/MissingAssemblyTests.vb

@@ -47,6 +47,11 @@ Namespace Microsoft.CodeAnalysis.VisualBasic.UnitTests
                               EvaluationContextBase.SystemXmlLinqIdentity)
         End Sub
 
+        <Fact>
+        Public Sub ErrorsRequiringVbCore()
+            Assert.Equal(EvaluationContextBase.MicrosoftVisualBasicIdentity, GetMissingAssemblyIdentities(ERRID.ERR_MissingRuntimeHelper).Single())
+        End Sub
+
         <Fact>
         Public Sub MultipleAssemblyArguments()
             Dim identity1 = New AssemblyIdentity(GetUniqueName())
@@ -192,6 +197,38 @@ End Class
                               EvaluationContextBase.SystemXmlLinqIdentity)
         End Sub
 
+        <Fact>
+        Public Sub ERR_MissingRuntimeAssembly()
+            Const source = "
+Public Class C
+    Public Sub M(o As Object)
+    End Sub
+End Class
+"
+            Dim comp = CreateCompilationWithMscorlib({source}, compOptions:=TestOptions.DebugDll)
+            Dim context = CreateMethodContextWithReferences(comp, "C.M", MscorlibRef)
+
+            Const expectedError = "(1,2): error BC35000: Requested operation is not available because the runtime library function 'Microsoft.VisualBasic.CompilerServices.Operators.CompareObjectEqual' is not defined."
+            Dim expectedMissingAssemblyIdentity = EvaluationContextBase.MicrosoftVisualBasicIdentity
+
+            Dim resultProperties As ResultProperties = Nothing
+            Dim actualError As String = Nothing
+            Dim actualMissingAssemblyIdentities As ImmutableArray(Of AssemblyIdentity) = Nothing
+
+            context.CompileExpression(
+                DefaultInspectionContext.Instance,
+                "o = o",
+                DkmEvaluationFlags.TreatAsExpression,
+                DiagnosticFormatter.Instance,
+                resultProperties,
+                actualError,
+                actualMissingAssemblyIdentities,
+                EnsureEnglishUICulture.PreferredOrNull,
+                testData:=Nothing)
+            Assert.Equal(expectedError, actualError)
+            Assert.Equal(expectedMissingAssemblyIdentity, actualMissingAssemblyIdentities.Single())
+        End Sub
+
         <WorkItem(1124725, "DevDiv")>
         <WorkItem(597, "GitHub")>
         <Fact>