Report error if 'record struct' constructor calls default parameterle…

…ss constructor

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

@@ -3497,7 +3497,7 @@ private BoundNode BindConstructorBody(ConstructorDeclarationSyntax constructor,
 
             bool thisInitializer = initializer?.IsKind(SyntaxKind.ThisConstructorInitializer) == true;
             if (!thisInitializer &&
-                ContainingType.GetMembersUnordered().OfType<SynthesizedRecordConstructor>().Any())
+                hasAnyRecordConstructors())
             {
                 var constructorSymbol = (MethodSymbol)this.ContainingMember();
                 if (!constructorSymbol.IsStatic &&
@@ -3514,6 +3514,12 @@ private BoundNode BindConstructorBody(ConstructorDeclarationSyntax constructor,
                 && thisInitializer
                 && ContainingType.IsDefaultValueTypeConstructor(initializer);
 
+            if (skipInitializer &&
+                hasAnyRecordConstructors())
+            {
+                Error(diagnostics, ErrorCode.ERR_RecordStructConstructorCallsDefaultConstructor, initializer.ThisOrBaseKeyword);
+            }
+
             // Using BindStatement to bind block to make sure we are reusing results of partial binding in SemanticModel
             return new BoundConstructorMethodBody(constructor,
                                                   bodyBinder.GetDeclaredLocalsForScope(constructor),
@@ -3524,6 +3530,9 @@ private BoundNode BindConstructorBody(ConstructorDeclarationSyntax constructor,
                                                       null :
                                                       bodyBinder.BindExpressionBodyAsBlock(constructor.ExpressionBody,
                                                                                            constructor.Body == null ? diagnostics : BindingDiagnosticBag.Discarded));
+
+            bool hasAnyRecordConstructors() =>
+                ContainingType.GetMembersUnordered().OfType<SynthesizedRecordConstructor>().Any();
         }
 
         internal virtual BoundExpressionStatement BindConstructorInitializer(ConstructorInitializerSyntax initializer, BindingDiagnosticBag diagnostics)

src/Compilers/CSharp/Portable/CSharpResources.resx

@@ -6911,6 +6911,9 @@ To remove the warning, you can use /reference instead (set the Embed Interop Typ
   <data name="ERR_LambdaWithAttributesToExpressionTree" xml:space="preserve">
     <value>A lambda expression with attributes cannot be converted to an expression tree</value>
   </data>
+  <data name="ERR_RecordStructConstructorCallsDefaultConstructor" xml:space="preserve">
+    <value>A 'this' initializer for a 'record struct' constructor cannot call the default parameterless constructor.</value>
+  </data>
   <data name="WRN_CompileTimeCheckedOverflow" xml:space="preserve">
     <value>The operation may overflow '{0}' at runtime (use 'unchecked' syntax to override)</value>
   </data>

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

@@ -2023,6 +2023,7 @@ internal enum ErrorCode
         ERR_MisplacedSlicePattern = 8980,
 
         WRN_LowerCaseTypeName = 8981,
+        ERR_RecordStructConstructorCallsDefaultConstructor = 8982,
 
         #endregion