A better error message. ( keyword should be in ' ' quotes )

src/Compilers/CSharp/Portable/CSharpResources.Designer.cs

@@ -5426,7 +5426,7 @@ internal class CSharpResources {
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to In arguments cannot be used in dynamically dispatched expession..
+        ///   Looks up a localized string similar to Arguments with &apos;in&apos; modifier cannot be used in dynamically dispatched expessions..
         /// </summary>
         internal static string ERR_InDynamicMethodArg {
             get {

src/Compilers/CSharp/Portable/CSharpResources.resx

@@ -5239,6 +5239,6 @@ To remove the warning, you can use /reference instead (set the Embed Interop Typ
     <value>A default literal 'default' is not valid as a pattern. Use another literal (e.g. '0' or 'null') as appropriate. To match everything, use a discard pattern 'var _'.</value>
   </data>
   <data name="ERR_InDynamicMethodArg" xml:space="preserve">
-    <value>In arguments cannot be used in dynamically dispatched expession.</value>
+    <value>Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</value>
   </data>
 </root>

src/Compilers/CSharp/Portable/xlf/CSharpResources.cs.xlf

@@ -8586,8 +8586,8 @@ Pokud chcete odstranit toto varování, můžete místo toho použít /reference
         <note />
       </trans-unit>
       <trans-unit id="ERR_InDynamicMethodArg">
-        <source>In arguments cannot be used in dynamically dispatched expession.</source>
-        <target state="new">In arguments cannot be used in dynamically dispatched expession.</target>
+        <source>Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</source>
+        <target state="new">Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</target>
         <note />
       </trans-unit>
     </body>

src/Compilers/CSharp/Portable/xlf/CSharpResources.de.xlf

@@ -8586,8 +8586,8 @@ Um die Warnung zu beheben, können Sie stattdessen /reference verwenden (Einbett
         <note />
       </trans-unit>
       <trans-unit id="ERR_InDynamicMethodArg">
-        <source>In arguments cannot be used in dynamically dispatched expession.</source>
-        <target state="new">In arguments cannot be used in dynamically dispatched expession.</target>
+        <source>Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</source>
+        <target state="new">Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</target>
         <note />
       </trans-unit>
     </body>

src/Compilers/CSharp/Portable/xlf/CSharpResources.es.xlf

@@ -8586,8 +8586,8 @@ Para eliminar la advertencia puede usar /reference (establezca la propiedad Embe
         <note />
       </trans-unit>
       <trans-unit id="ERR_InDynamicMethodArg">
-        <source>In arguments cannot be used in dynamically dispatched expession.</source>
-        <target state="new">In arguments cannot be used in dynamically dispatched expession.</target>
+        <source>Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</source>
+        <target state="new">Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</target>
         <note />
       </trans-unit>
     </body>

src/Compilers/CSharp/Portable/xlf/CSharpResources.fr.xlf

@@ -8586,8 +8586,8 @@ Pour supprimer l'avertissement, vous pouvez utiliser la commande /reference (dé
         <note />
       </trans-unit>
       <trans-unit id="ERR_InDynamicMethodArg">
-        <source>In arguments cannot be used in dynamically dispatched expession.</source>
-        <target state="new">In arguments cannot be used in dynamically dispatched expession.</target>
+        <source>Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</source>
+        <target state="new">Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</target>
         <note />
       </trans-unit>
     </body>

src/Compilers/CSharp/Portable/xlf/CSharpResources.it.xlf

@@ -8586,8 +8586,8 @@ Per rimuovere l'avviso, è invece possibile usare /reference (impostare la propr
         <note />
       </trans-unit>
       <trans-unit id="ERR_InDynamicMethodArg">
-        <source>In arguments cannot be used in dynamically dispatched expession.</source>
-        <target state="new">In arguments cannot be used in dynamically dispatched expession.</target>
+        <source>Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</source>
+        <target state="new">Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</target>
         <note />
       </trans-unit>
     </body>

src/Compilers/CSharp/Portable/xlf/CSharpResources.ja.xlf

@@ -8586,8 +8586,8 @@ To remove the warning, you can use /reference instead (set the Embed Interop Typ
         <note />
       </trans-unit>
       <trans-unit id="ERR_InDynamicMethodArg">
-        <source>In arguments cannot be used in dynamically dispatched expession.</source>
-        <target state="new">In arguments cannot be used in dynamically dispatched expession.</target>
+        <source>Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</source>
+        <target state="new">Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</target>
         <note />
       </trans-unit>
     </body>

src/Compilers/CSharp/Portable/xlf/CSharpResources.ko.xlf

@@ -8586,8 +8586,8 @@ To remove the warning, you can use /reference instead (set the Embed Interop Typ
         <note />
       </trans-unit>
       <trans-unit id="ERR_InDynamicMethodArg">
-        <source>In arguments cannot be used in dynamically dispatched expession.</source>
-        <target state="new">In arguments cannot be used in dynamically dispatched expession.</target>
+        <source>Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</source>
+        <target state="new">Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</target>
         <note />
       </trans-unit>
     </body>

src/Compilers/CSharp/Portable/xlf/CSharpResources.pl.xlf

@@ -8586,8 +8586,8 @@ Aby usunąć ostrzeżenie, możesz zamiast tego użyć opcji /reference (ustaw w
         <note />
       </trans-unit>
       <trans-unit id="ERR_InDynamicMethodArg">
-        <source>In arguments cannot be used in dynamically dispatched expession.</source>
-        <target state="new">In arguments cannot be used in dynamically dispatched expession.</target>
+        <source>Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</source>
+        <target state="new">Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</target>
         <note />
       </trans-unit>
     </body>

src/Compilers/CSharp/Portable/xlf/CSharpResources.pt-BR.xlf

@@ -8586,8 +8586,8 @@ Para incorporar informações de tipo de interoperabilidade para os dois assembl
         <note />
       </trans-unit>
       <trans-unit id="ERR_InDynamicMethodArg">
-        <source>In arguments cannot be used in dynamically dispatched expession.</source>
-        <target state="new">In arguments cannot be used in dynamically dispatched expession.</target>
+        <source>Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</source>
+        <target state="new">Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</target>
         <note />
       </trans-unit>
     </body>

src/Compilers/CSharp/Portable/xlf/CSharpResources.ru.xlf

@@ -8586,8 +8586,8 @@ To remove the warning, you can use /reference instead (set the Embed Interop Typ
         <note />
       </trans-unit>
       <trans-unit id="ERR_InDynamicMethodArg">
-        <source>In arguments cannot be used in dynamically dispatched expession.</source>
-        <target state="new">In arguments cannot be used in dynamically dispatched expession.</target>
+        <source>Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</source>
+        <target state="new">Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</target>
         <note />
       </trans-unit>
     </body>

src/Compilers/CSharp/Portable/xlf/CSharpResources.tr.xlf

@@ -8586,8 +8586,8 @@ Uyarıyı kaldırmak için, /reference kullanabilirsiniz (Birlikte Çalışma T
         <note />
       </trans-unit>
       <trans-unit id="ERR_InDynamicMethodArg">
-        <source>In arguments cannot be used in dynamically dispatched expession.</source>
-        <target state="new">In arguments cannot be used in dynamically dispatched expession.</target>
+        <source>Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</source>
+        <target state="new">Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</target>
         <note />
       </trans-unit>
     </body>

src/Compilers/CSharp/Portable/xlf/CSharpResources.zh-Hans.xlf

@@ -8586,8 +8586,8 @@ To remove the warning, you can use /reference instead (set the Embed Interop Typ
         <note />
       </trans-unit>
       <trans-unit id="ERR_InDynamicMethodArg">
-        <source>In arguments cannot be used in dynamically dispatched expession.</source>
-        <target state="new">In arguments cannot be used in dynamically dispatched expession.</target>
+        <source>Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</source>
+        <target state="new">Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</target>
         <note />
       </trans-unit>
     </body>

src/Compilers/CSharp/Portable/xlf/CSharpResources.zh-Hant.xlf

@@ -8586,8 +8586,8 @@ To remove the warning, you can use /reference instead (set the Embed Interop Typ
         <note />
       </trans-unit>
       <trans-unit id="ERR_InDynamicMethodArg">
-        <source>In arguments cannot be used in dynamically dispatched expession.</source>
-        <target state="new">In arguments cannot be used in dynamically dispatched expession.</target>
+        <source>Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</source>
+        <target state="new">Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.</target>
         <note />
       </trans-unit>
     </body>

src/Compilers/CSharp/Test/Semantic/Semantics/DynamicTests.cs

@@ -3921,7 +3921,7 @@ static void M1()
             var comp = CreateCompilationWithMscorlib45AndCSruntime(source, parseOptions: TestOptions.Regular7_2);
 
             comp.VerifyEmitDiagnostics(
-                // (8,17): error CS8364: In arguments cannot be used in dynamically dispatched expession.
+                // (8,17): error CS8364: Arguments with 'in' modifier cannot be used in dynamically dispatched expessions.
                 //         d.M2(in x);
                 Diagnostic(ErrorCode.ERR_InDynamicMethodArg, "x").WithLocation(8, 17)
                 );