Enforce more code style in Compilers area

.editorconfig

@@ -148,6 +148,18 @@ dotnet_diagnostic.RS2008.severity = none
 dotnet_diagnostic.IDE0073.severity = warning
 file_header_template = Licensed to the .NET Foundation under one or more agreements.\nThe .NET Foundation licenses this file to you under the MIT license.\nSee the LICENSE file in the project root for more information.
 
+# IDE0035: Remove unreachable code
+dotnet_diagnostic.IDE0035.severity = warning
+
+# IDE0036: Order modifiers
+dotnet_diagnostic.IDE0036.severity = warning
+
+# IDE0043: Format string contains invalid placeholder
+dotnet_diagnostic.IDE0043.severity = warning
+
+# IDE0044: Make field readonly
+dotnet_diagnostic.IDE0044.severity = warning
+
 # CSharp code style settings:
 [*.cs]
 # Newline settings
@@ -232,21 +244,9 @@ csharp_prefer_braces = when_multiline:warning
 # NOTE: We need the below severity entry for Add Braces due to https://github.com/dotnet/roslyn/issues/44201
 dotnet_diagnostic.IDE0011.severity = warning
 
-# IDE0035: Remove unreachable code
-dotnet_diagnostic.IDE0035.severity = warning
-
-# IDE0036: Order modifiers
-dotnet_diagnostic.IDE0036.severity = warning
-
 # IDE0040: Add accessibility modifiers
 dotnet_diagnostic.IDE0040.severity = warning
 
-# IDE0043: Format string contains invalid placeholder
-dotnet_diagnostic.IDE0043.severity = warning
-
-# IDE0044: Make field readonly
-dotnet_diagnostic.IDE0044.severity = warning
-
 # CONSIDER: Are IDE0051 and IDE0052 too noisy to be warnings for IDE editing scenarios? Should they be made build-only warnings?
 # IDE0051: Remove unused private member
 dotnet_diagnostic.IDE0051.severity = warning

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

@@ -1645,7 +1645,7 @@ private static void ReportReadonlyLocalError(SyntaxNode node, LocalSymbol local,
             Error(diagnostics, ReadOnlyLocalErrors[index], node, local, cause.Localize());
         }
 
-        static private ErrorCode GetThisLvalueError(BindValueKind kind, bool isValueType)
+        private static ErrorCode GetThisLvalueError(BindValueKind kind, bool isValueType)
         {
             switch (kind)
             {
@@ -1717,7 +1717,7 @@ private static ErrorCode GetMethodGroupOrFunctionPointerLvalueError(BindValueKin
             return ErrorCode.ERR_AssgReadonlyLocalCause;
         }
 
-        static private ErrorCode GetStandardLvalueError(BindValueKind kind)
+        private static ErrorCode GetStandardLvalueError(BindValueKind kind)
         {
             switch (kind)
             {
@@ -1750,7 +1750,7 @@ static private ErrorCode GetStandardLvalueError(BindValueKind kind)
             throw ExceptionUtilities.UnexpectedValue(kind);
         }
 
-        static private ErrorCode GetStandardRValueRefEscapeError(uint escapeTo)
+        private static ErrorCode GetStandardRValueRefEscapeError(uint escapeTo)
         {
             if (escapeTo == Binder.ExternalScope)
             {

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

@@ -81,7 +81,7 @@ internal bool IsEarlyAttributeBinder
         /// <summary>
         /// Get the next binder in which to look up a name, if not found by this binder.
         /// </summary>
-        internal protected Binder? Next { get; }
+        protected internal Binder? Next { get; }
 
         /// <summary>
         /// <see cref="OverflowChecks.Enabled"/> if we are in an explicitly checked context (within checked block or expression).

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

@@ -22,7 +22,7 @@ public CatchClauseBinder(Binder enclosing, CatchClauseSyntax syntax)
             _syntax = syntax;
         }
 
-        override protected ImmutableArray<LocalSymbol> BuildLocals()
+        protected override ImmutableArray<LocalSymbol> BuildLocals()
         {
             var locals = ArrayBuilder<LocalSymbol>.GetInstance();
 

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

@@ -24,7 +24,7 @@ public FixedStatementBinder(Binder enclosing, FixedStatementSyntax syntax)
             _syntax = syntax;
         }
 
-        override protected ImmutableArray<LocalSymbol> BuildLocals()
+        protected override ImmutableArray<LocalSymbol> BuildLocals()
         {
             if (_syntax.Declaration != null)
             {

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

@@ -23,7 +23,7 @@ public ForLoopBinder(Binder enclosing, ForStatementSyntax syntax)
             _syntax = syntax;
         }
 
-        override protected ImmutableArray<LocalSymbol> BuildLocals()
+        protected override ImmutableArray<LocalSymbol> BuildLocals()
         {
             var locals = ArrayBuilder<LocalSymbol>.GetInstance();
 

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

@@ -48,7 +48,7 @@ internal override ImmutableArray<LocalFunctionSymbol> GetDeclaredLocalFunctionsF
         }
 
         // Labels potentially shared across multiple ScriptLocalScopeBinder instances.
-        new internal sealed class Labels
+        internal new sealed class Labels
         {
             private readonly SynthesizedInteractiveInitializerMethod _scriptInitializer;
             private readonly CompilationUnitSyntax _syntax;

src/Compilers/CSharp/Portable/Binder/Semantics/Conversions/Conversion.cs

@@ -82,7 +82,7 @@ internal DeconstructionUncommonData(DeconstructMethodInfo deconstructMethodInfoO
                 DeconstructMethodInfo = deconstructMethodInfoOpt;
             }
 
-            readonly internal DeconstructMethodInfo DeconstructMethodInfo;
+            internal readonly DeconstructMethodInfo DeconstructMethodInfo;
         }
 
         private Conversion(
@@ -1050,9 +1050,9 @@ internal DeconstructMethodInfo(BoundExpression invocation, BoundDeconstructValue
             (Invocation, InputPlaceholder, OutputPlaceholders) = (invocation, inputPlaceholder, outputPlaceholders);
         }
 
-        readonly internal BoundExpression Invocation;
-        readonly internal BoundDeconstructValuePlaceholder InputPlaceholder;
-        readonly internal ImmutableArray<BoundDeconstructValuePlaceholder> OutputPlaceholders;
+        internal readonly BoundExpression Invocation;
+        internal readonly BoundDeconstructValuePlaceholder InputPlaceholder;
+        internal readonly ImmutableArray<BoundDeconstructValuePlaceholder> OutputPlaceholders;
         internal bool IsDefault => Invocation is null;
     }
 }

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

@@ -127,7 +127,7 @@ private static Dictionary<object, SourceLabelSymbol> BuildLabelsByValue(Immutabl
             return map;
         }
 
-        override protected ImmutableArray<LocalSymbol> BuildLocals()
+        protected override ImmutableArray<LocalSymbol> BuildLocals()
         {
             var builder = ArrayBuilder<LocalSymbol>.GetInstance();
 

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

@@ -23,7 +23,7 @@ public UsingStatementBinder(Binder enclosing, UsingStatementSyntax syntax)
             _syntax = syntax;
         }
 
-        override protected ImmutableArray<LocalSymbol> BuildLocals()
+        protected override ImmutableArray<LocalSymbol> BuildLocals()
         {
             ExpressionSyntax expressionSyntax = TargetExpressionSyntax;
             VariableDeclarationSyntax declarationSyntax = _syntax.Declaration;

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

@@ -43,7 +43,7 @@ internal override BoundDoStatement BindDoParts(DiagnosticBag diagnostics, Binder
             return new BoundDoStatement(node, this.Locals, condition, body, this.BreakLabel, this.ContinueLabel);
         }
 
-        override protected ImmutableArray<LocalSymbol> BuildLocals()
+        protected override ImmutableArray<LocalSymbol> BuildLocals()
         {
             var locals = ArrayBuilder<LocalSymbol>.GetInstance();
             ExpressionSyntax condition;

src/Compilers/CSharp/Portable/BoundTree/TupleBinaryOperatorInfo.cs

@@ -96,7 +96,7 @@ internal class Multiple : TupleBinaryOperatorInfo
         {
             internal readonly ImmutableArray<TupleBinaryOperatorInfo> Operators;
 
-            static internal readonly Multiple ErrorInstance =
+            internal static readonly Multiple ErrorInstance =
                 new Multiple(operators: ImmutableArray<TupleBinaryOperatorInfo>.Empty, leftConvertedTypeOpt: null, rightConvertedTypeOpt: null);
 
             internal Multiple(ImmutableArray<TupleBinaryOperatorInfo> operators, TypeSymbol? leftConvertedTypeOpt, TypeSymbol? rightConvertedTypeOpt)

src/Compilers/CSharp/Portable/CommandLine/CSharpCommandLineParser.cs

@@ -25,7 +25,7 @@ public class CSharpCommandLineParser : CommandLineParser
         public static CSharpCommandLineParser Default { get; } = new CSharpCommandLineParser();
         public static CSharpCommandLineParser Script { get; } = new CSharpCommandLineParser(isScriptCommandLineParser: true);
 
-        private readonly static char[] s_quoteOrEquals = new[] { '"', '=' };
+        private static readonly char[] s_quoteOrEquals = new[] { '"', '=' };
 
         internal CSharpCommandLineParser(bool isScriptCommandLineParser = false)
             : base(CSharp.MessageProvider.Instance, isScriptCommandLineParser)

src/Compilers/CSharp/Portable/Compilation/AttributeSemanticModel.cs

@@ -60,7 +60,7 @@ private NamedTypeSymbol AttributeType
             }
         }
 
-        internal protected override CSharpSyntaxNode GetBindableSyntaxNode(CSharpSyntaxNode node)
+        protected internal override CSharpSyntaxNode GetBindableSyntaxNode(CSharpSyntaxNode node)
         {
             switch (node.Kind())
             {

src/Compilers/CSharp/Portable/Compilation/CSharpCompilation.cs

@@ -3408,7 +3408,7 @@ protected override INamedTypeSymbol CommonCreateNativeIntegerTypeSymbol(bool sig
             return CreateNativeIntegerTypeSymbol(signed).GetPublicSymbol();
         }
 
-        new internal NamedTypeSymbol CreateNativeIntegerTypeSymbol(bool signed)
+        internal new NamedTypeSymbol CreateNativeIntegerTypeSymbol(bool signed)
         {
             return GetSpecialType(signed ? SpecialType.System_IntPtr : SpecialType.System_UIntPtr).AsNativeInteger();
         }

src/Compilers/CSharp/Portable/Compilation/InitializerSemanticModel.cs

@@ -77,7 +77,7 @@ internal static InitializerSemanticModel CreateSpeculative(SyntaxTreeSemanticMod
             return new InitializerSemanticModel(syntax, owner, rootBinder, parentSemanticModelOpt: parentSemanticModel, parentRemappedSymbolsOpt: parentRemappedSymbolsOpt, speculatedPosition: position);
         }
 
-        internal protected override CSharpSyntaxNode GetBindableSyntaxNode(CSharpSyntaxNode node)
+        protected internal override CSharpSyntaxNode GetBindableSyntaxNode(CSharpSyntaxNode node)
         {
             return IsBindableInitializer(node) ? node : base.GetBindableSyntaxNode(node);
         }

src/Compilers/CSharp/Portable/Compilation/MemberSemanticModel.cs

@@ -2131,7 +2131,7 @@ internal ImmutableArray<BoundNode> GetBoundNodes(CSharpSyntaxNode node)
         }
 
         // some nodes don't have direct semantic meaning by themselves and so we need to bind a different node that does
-        internal protected virtual CSharpSyntaxNode GetBindableSyntaxNode(CSharpSyntaxNode node)
+        protected internal virtual CSharpSyntaxNode GetBindableSyntaxNode(CSharpSyntaxNode node)
         {
             switch (node.Kind())
             {

src/Compilers/CSharp/Portable/Emitter/Model/SymbolAdapter.cs

@@ -22,7 +22,7 @@ internal partial class Symbol : Cci.IReference
         /// Checks if this symbol is a definition and its containing module is a SourceModuleSymbol.
         /// </summary>
         [Conditional("DEBUG")]
-        internal protected void CheckDefinitionInvariant()
+        protected internal void CheckDefinitionInvariant()
         {
             // can't be generic instantiation
             Debug.Assert(this.IsDefinition);

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

@@ -12,6 +12,6 @@ internal CSharpDiagnosticFormatter()
         {
         }
 
-        public new static CSharpDiagnosticFormatter Instance { get; } = new CSharpDiagnosticFormatter();
+        public static new CSharpDiagnosticFormatter Instance { get; } = new CSharpDiagnosticFormatter();
     }
 }

src/Compilers/CSharp/Portable/FlowAnalysis/AbstractFlowPass.cs

@@ -1870,7 +1870,7 @@ public override BoundNode VisitDeconstructionAssignmentOperator(BoundDeconstruct
             return null;
         }
 
-        public override sealed BoundNode VisitOutDeconstructVarPendingInference(OutDeconstructVarPendingInference node)
+        public sealed override BoundNode VisitOutDeconstructVarPendingInference(OutDeconstructVarPendingInference node)
         {
             // OutDeconstructVarPendingInference nodes are only used within initial binding, but don't survive past that stage
             throw ExceptionUtilities.Unreachable;
@@ -3018,7 +3018,7 @@ public override BoundNode VisitAwaitableValuePlaceholder(BoundAwaitableValuePlac
             return null;
         }
 
-        public override sealed BoundNode VisitOutVariablePendingInference(OutVariablePendingInference node)
+        public sealed override BoundNode VisitOutVariablePendingInference(OutVariablePendingInference node)
         {
             throw ExceptionUtilities.Unreachable;
         }

src/Compilers/CSharp/Portable/FlowAnalysis/ExitPointsWalker.cs

@@ -107,12 +107,12 @@ public override BoundNode VisitWhileStatement(BoundWhileStatement node)
             return base.VisitWhileStatement(node);
         }
 
-        override protected void EnterRegion()
+        protected override void EnterRegion()
         {
             base.EnterRegion();
         }
 
-        override protected void LeaveRegion()
+        protected override void LeaveRegion()
         {
             foreach (var pending in PendingBranches)
             {

src/Compilers/CSharp/Portable/FlowAnalysis/RegionReachableWalker.cs

@@ -45,7 +45,7 @@ protected override void EnterRegion()
             base.EnterRegion();
         }
 
-        override protected void LeaveRegion()
+        protected override void LeaveRegion()
         {
             _regionEndPointIsReachable = this.State.Alive;
             base.LeaveRegion();

src/Compilers/CSharp/Portable/Lowering/LocalRewriter/LocalRewriter.cs

@@ -422,7 +422,7 @@ private void RemovePlaceholderReplacement(BoundValuePlaceholderBase placeholder)
             Debug.Assert(removed);
         }
 
-        public override sealed BoundNode VisitOutDeconstructVarPendingInference(OutDeconstructVarPendingInference node)
+        public sealed override BoundNode VisitOutDeconstructVarPendingInference(OutDeconstructVarPendingInference node)
         {
             // OutDeconstructVarPendingInference nodes are only used within initial binding, but don't survive past that stage
             throw ExceptionUtilities.Unreachable;

src/Compilers/CSharp/Portable/Lowering/LocalRewriter/LocalRewriter_LocalDeclaration.cs

@@ -86,7 +86,7 @@ private BoundStatement InstrumentLocalDeclarationIfNecessary(BoundLocalDeclarati
             return rewrittenLocalDeclaration;
         }
 
-        public override sealed BoundNode VisitOutVariablePendingInference(OutVariablePendingInference node)
+        public sealed override BoundNode VisitOutVariablePendingInference(OutVariablePendingInference node)
         {
             throw ExceptionUtilities.Unreachable;
         }

src/Compilers/CSharp/Portable/Lowering/MethodToClassRewriter.cs

@@ -146,7 +146,7 @@ public override BoundNode VisitBlock(BoundBlock node)
             return node.Update(newLocals, newLocalFunctions, newStatements);
         }
 
-        public override abstract BoundNode VisitScope(BoundScope node);
+        public abstract override BoundNode VisitScope(BoundScope node);
 
         public override BoundNode VisitSequence(BoundSequence node)
         {

src/Compilers/CSharp/Portable/Parser/Lexer_StringLiteral.cs

@@ -276,7 +276,7 @@ public Interpolation(int openBracePosition, int colonPosition, int closeBracePos
         /// Turn a (parsed) interpolated string nonterminal into an interpolated string token.
         /// </summary>
         /// <param name="interpolatedString"></param>
-        static internal SyntaxToken RescanInterpolatedString(InterpolatedStringExpressionSyntax interpolatedString)
+        internal static SyntaxToken RescanInterpolatedString(InterpolatedStringExpressionSyntax interpolatedString)
         {
             var text = interpolatedString.ToString();
             var kind = SyntaxKind.InterpolatedStringToken;

src/Compilers/CSharp/Portable/Symbols/Attributes/AttributeData.cs

@@ -242,7 +242,7 @@ internal void DecodeSecurityAttribute<T>(Symbol targetSymbol, CSharpCompilation
             }
         }
 
-        static internal void DecodeSkipLocalsInitAttribute<T>(CSharpCompilation compilation, ref DecodeWellKnownAttributeArguments<AttributeSyntax, CSharpAttributeData, AttributeLocation> arguments)
+        internal static void DecodeSkipLocalsInitAttribute<T>(CSharpCompilation compilation, ref DecodeWellKnownAttributeArguments<AttributeSyntax, CSharpAttributeData, AttributeLocation> arguments)
             where T : WellKnownAttributeData, ISkipLocalsInitAttributeTarget, new()
         {
             arguments.GetOrCreateData<T>().HasSkipLocalsInitAttribute = true;
@@ -253,7 +253,7 @@ static internal void DecodeSkipLocalsInitAttribute<T>(CSharpCompilation compilat
             }
         }
 
-        static internal void DecodeMemberNotNullAttribute<T>(TypeSymbol type, ref DecodeWellKnownAttributeArguments<AttributeSyntax, CSharpAttributeData, AttributeLocation> arguments)
+        internal static void DecodeMemberNotNullAttribute<T>(TypeSymbol type, ref DecodeWellKnownAttributeArguments<AttributeSyntax, CSharpAttributeData, AttributeLocation> arguments)
             where T : WellKnownAttributeData, IMemberNotNullAttributeTarget, new()
         {
             var value = arguments.Attribute.CommonConstructorArguments[0];
@@ -303,7 +303,7 @@ private static void ReportBadNotNullMemberIfNeeded(TypeSymbol type, DecodeWellKn
             arguments.Diagnostics.Add(ErrorCode.WRN_MemberNotNullBadMember, arguments.AttributeSyntaxOpt.Location, memberName);
         }
 
-        static internal void DecodeMemberNotNullWhenAttribute<T>(TypeSymbol type, ref DecodeWellKnownAttributeArguments<AttributeSyntax, CSharpAttributeData, AttributeLocation> arguments)
+        internal static void DecodeMemberNotNullWhenAttribute<T>(TypeSymbol type, ref DecodeWellKnownAttributeArguments<AttributeSyntax, CSharpAttributeData, AttributeLocation> arguments)
             where T : WellKnownAttributeData, IMemberNotNullAttributeTarget, new()
         {
             var value = arguments.Attribute.CommonConstructorArguments[1];

src/Compilers/CSharp/Portable/Symbols/Attributes/PEAttributeData.cs

@@ -54,7 +54,7 @@ public override SyntaxReference? ApplicationSyntaxReference
             get { return null; }
         }
 
-        internal protected override ImmutableArray<TypedConstant> CommonConstructorArguments
+        protected internal override ImmutableArray<TypedConstant> CommonConstructorArguments
         {
             get
             {
@@ -63,7 +63,7 @@ internal protected override ImmutableArray<TypedConstant> CommonConstructorArgum
             }
         }
 
-        internal protected override ImmutableArray<KeyValuePair<string, TypedConstant>> CommonNamedArguments
+        protected internal override ImmutableArray<KeyValuePair<string, TypedConstant>> CommonNamedArguments
         {
             get
             {

src/Compilers/CSharp/Portable/Symbols/Attributes/SourceAttributeData.cs

@@ -169,12 +169,12 @@ internal override bool HasErrors
             }
         }
 
-        internal protected sealed override ImmutableArray<TypedConstant> CommonConstructorArguments
+        protected internal sealed override ImmutableArray<TypedConstant> CommonConstructorArguments
         {
             get { return _constructorArguments; }
         }
 
-        internal protected sealed override ImmutableArray<KeyValuePair<string, TypedConstant>> CommonNamedArguments
+        protected internal sealed override ImmutableArray<KeyValuePair<string, TypedConstant>> CommonNamedArguments
         {
             get { return _namedArguments; }
         }

src/Compilers/CSharp/Portable/Symbols/ConstructedNamedTypeSymbol.cs

@@ -35,7 +35,7 @@ public override NamedTypeSymbol ConstructedFrom
             get { return this; }
         }
 
-        public override sealed bool AreLocalsZeroed
+        public sealed override bool AreLocalsZeroed
         {
             get { throw ExceptionUtilities.Unreachable; }
         }
@@ -125,7 +125,7 @@ internal sealed override bool GetUnificationUseSiteDiagnosticRecursive(ref Diagn
             return false;
         }
 
-        public override sealed bool AreLocalsZeroed
+        public sealed override bool AreLocalsZeroed
         {
             get { throw ExceptionUtilities.Unreachable; }
         }

src/Compilers/CSharp/Portable/Symbols/EventSymbol.cs

@@ -41,7 +41,7 @@ internal EventSymbol()
             }
         }
 
-        protected override sealed Symbol OriginalSymbolDefinition
+        protected sealed override Symbol OriginalSymbolDefinition
         {
             get
             {