Remove LangVer check from extended nameof binding (dotnet#62339)

Author: jcouv

docs/compilers/CSharp/Compiler Breaking Changes - DotNet 7.md

@@ -96,11 +96,6 @@ Possible workarounds are:
 
 1. Rename the type parameter or parameter to avoid shadowing the name from outer scope.
 1. Use a string literal instead of the `nameof` operator.
-1. Downgrade the `<LangVersion>` element to 9.0 or earlier.
-
-Note: The break will also apply to C# 10 and earlier when .NET 7 ships, but is
-currently scoped down to users of LangVer=preview.  
-Tracked by https://github.com/dotnet/roslyn/issues/60640
 
 ## Cannot return an out parameter by reference
 

src/Compilers/CSharp/Portable/Binder/LocalBinderFactory.cs

@@ -208,9 +208,7 @@ public override void VisitInvocationExpression(InvocationExpressionSyntax node)
 
                 WithTypeParametersBinder? withTypeParametersBinder;
                 Binder? withParametersBinder;
-                // The LangVer check will be removed before shipping .NET 7.
-                // Tracked by https://github.com/dotnet/roslyn/issues/60640
-                if (((_enclosing.Flags & BinderFlags.InContextualAttributeBinder) != 0) && _enclosing.Compilation.IsFeatureEnabled(MessageID.IDS_FeatureExtendedNameofScope))
+                if ((_enclosing.Flags & BinderFlags.InContextualAttributeBinder) != 0)
                 {
                     var attributeTarget = getAttributeTarget(_enclosing);
                     withTypeParametersBinder = getExtraWithTypeParametersBinder(_enclosing, attributeTarget);

src/Compilers/CSharp/Portable/Errors/MessageID.cs

@@ -252,12 +252,11 @@ internal enum MessageID
         IDS_FeatureUtf8StringLiterals = MessageBase + 12822,
 
         IDS_FeatureUnsignedRightShift = MessageBase + 12823,
-        IDS_FeatureExtendedNameofScope = MessageBase + 12824,
 
-        IDS_FeatureRelaxedShiftOperator = MessageBase + 12825,
-        IDS_FeatureRequiredMembers = MessageBase + 12826,
-        IDS_FeatureRefFields = MessageBase + 12827,
-        IDS_FeatureFileTypes = MessageBase + 12828,
+        IDS_FeatureRelaxedShiftOperator = MessageBase + 12824,
+        IDS_FeatureRequiredMembers = MessageBase + 12825,
+        IDS_FeatureRefFields = MessageBase + 12826,
+        IDS_FeatureFileTypes = MessageBase + 12827,
     }
 
     // Message IDs may refer to strings that need to be localized.
@@ -379,7 +378,6 @@ internal static LanguageVersion RequiredVersion(this MessageID feature)
                 case MessageID.IDS_FeatureCheckedUserDefinedOperators: // semantic check for declarations, parsing check for doc comments
                 case MessageID.IDS_FeatureUtf8StringLiterals: // semantic check
                 case MessageID.IDS_FeatureUnsignedRightShift: // semantic check for declarations and consumption, parsing check for doc comments
-                case MessageID.IDS_FeatureExtendedNameofScope: // semantic check
                 case MessageID.IDS_FeatureRelaxedShiftOperator: // semantic check
                 case MessageID.IDS_FeatureRefFields: // semantic check
                 case MessageID.IDS_FeatureFileTypes: // semantic check