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dotnet · Oct 13, 2021 · 267fc94 · 267fc94
1 parent 71b5b2d
commit 267fc94
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Showing 2 changed files with 5 additions and 8 deletions.
diff --git a/src/Compilers/CSharp/Portable/Binder/Binder_InterpolatedString.cs b/src/Compilers/CSharp/Portable/Binder/Binder_InterpolatedString.cs
@@ -19,9 +19,12 @@ internal partial class Binder
         private BoundExpression BindInterpolatedString(InterpolatedStringExpressionSyntax node, BindingDiagnosticBag diagnostics)
         {
             var startText = node.StringStartToken.Text;
-            if (startText.StartsWith("@$\""))
+            if (startText.StartsWith("@$\"") && !Compilation.IsFeatureEnabled(MessageID.IDS_FeatureAltInterpolatedVerbatimStrings))
             {
-                CheckFeatureAvailability(node, MessageID.IDS_FeatureAltInterpolatedVerbatimStrings, diagnostics, node.StringStartToken.GetLocation());
+                Error(diagnostics,
+                    ErrorCode.ERR_AltInterpolatedVerbatimStringsNotAvailable,
+                    node.StringStartToken.GetLocation(),
+                    new CSharpRequiredLanguageVersion(MessageID.IDS_FeatureAltInterpolatedVerbatimStrings.RequiredVersion()));
             }
 
             var builder = ArrayBuilder<BoundExpression>.GetInstance();

diff --git a/src/Compilers/CSharp/Portable/Errors/MessageID.cs b/src/Compilers/CSharp/Portable/Errors/MessageID.cs
@@ -328,12 +328,6 @@ private static CSDiagnosticInfo GetDisabledFeatureDiagnosticInfo(MessageID featu
                 return new CSDiagnosticInfo(ErrorCode.ERR_FeatureIsExperimental, feature.Localize(), requiredFeature);
             }
 
-            // Special string we give to clarify the issue when @$" is used instead of $@".
-            if (feature == MessageID.IDS_FeatureAltInterpolatedVerbatimStrings)
-            {
-                return new CSDiagnosticInfo(ErrorCode.ERR_AltInterpolatedVerbatimStringsNotAvailable, new CSharpRequiredLanguageVersion(feature.RequiredVersion()));
-            }
-
             LanguageVersion requiredVersion = feature.RequiredVersion();
             return requiredVersion == LanguageVersion.Preview.MapSpecifiedToEffectiveVersion()
                 ? new CSDiagnosticInfo(ErrorCode.ERR_FeatureInPreview, feature.Localize())