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Support marking generated public APIs as experimental #82131

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96ef084
Support marking syntax node types and fields as experimental.
333fred Jan 23, 2026
4250ca1
Mark collection expression nodes as experimental, suppress where nece…
333fred Jan 23, 2026
b3ed922
Support marking IOperation types as experimental.
333fred Jan 23, 2026
c690aa9
Mark collection expression arguments IOperation types as experimental
333fred Jan 23, 2026
175b78d
Update canary instructions
333fred Jan 23, 2026
21ed3b1
Addressing non-suppression comments.
333fred Jan 26, 2026
c74c04d
Add a global suppression
333fred Jan 29, 2026
26a3976
Update issue link
333fred Jan 29, 2026
1bbf7d9
Remove suppression from generated files
333fred Jan 29, 2026
bab901b
Break out public APIs into a section in the compiler test plan and ad…
333fred Jan 29, 2026
7f620b1
Revert "Remove suppression from generated files"
333fred Jan 29, 2026
da1a98f
Remove generation from the operation generator.
333fred Jan 29, 2026
ab2f266
Mark SyntaxKind.WithElement as experimental.
333fred Jan 29, 2026
364ec38
Fix public api bug that was not looking for experimental on containin…
333fred Jan 29, 2026
1e4c68f
Fix api file
333fred Jan 30, 2026
5699f27
PR feedback
333fred Feb 14, 2026
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2 changes: 2 additions & 0 deletions ...rp/Analyzers/UseCollectionInitializer/CSharpUseCollectionInitializerDiagnosticAnalyzer.cs
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Expand Up @@ -74,7 +74,9 @@ static IEnumerable<CollectionElementSyntax> GetMatchElements(ImmutableArray<Coll
}
else if (match.Node is ArgumentListSyntax argumentList)
{
#pragma warning disable RSEXPERIMENTAL006 // With Element: https://github.com/dotnet/roslyn/issues/80613
yield return WithElement(argumentList.WithoutTrivia());
#pragma warning restore RSEXPERIMENTAL006
}
}
}
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4 changes: 4 additions & 0 deletions src/Analyzers/CSharp/CodeFixes/UseCollectionExpression/CSharpCollectionExpressionRewriter.cs
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Expand Up @@ -210,7 +210,9 @@ CollectionExpressionSyntax CreateSingleElementCollection(CollectionMatch<TMatchN
CollectionElementSyntax CreateElement(CollectionMatch<TMatchNode> match)
{
if (match.Node is ArgumentListSyntax argumentList)
#pragma warning disable RSEXPERIMENTAL006 // With Element: https://github.com/dotnet/roslyn/issues/80613
return WithElement(argumentList.WithoutTrivia());
#pragma warning restore RSEXPERIMENTAL006

var expression = (ExpressionSyntax)(object)match.Node;
return match.UseSpread
Expand Down Expand Up @@ -592,7 +594,9 @@ IEnumerable<CollectionElementSyntax> CreateElements(
}
else if (node is ArgumentListSyntax argumentList)
{
#pragma warning disable RSEXPERIMENTAL006 // With Element: https://github.com/dotnet/roslyn/issues/80613
yield return WithElement(argumentList.WithoutTrivia());
#pragma warning restore RSEXPERIMENTAL006
}
else
{
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4 changes: 4 additions & 0 deletions src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs
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Expand Up @@ -5346,7 +5346,9 @@ private BoundExpression BindCollectionExpression(CollectionExpressionSyntax synt
var builder = ArrayBuilder<BoundNode>.GetInstance(syntax.Elements.Count);
foreach (var element in syntax.Elements)
{
#pragma warning disable RSEXPERIMENTAL006 // With Element: https://github.com/dotnet/roslyn/issues/80613
if (element is WithElementSyntax withElementSyntax)
#pragma warning restore RSEXPERIMENTAL006
{
MessageID.IDS_FeatureCollectionExpressionArguments.CheckFeatureAvailability(diagnostics, syntax, withElementSyntax.WithKeyword.GetLocation());

Expand Down Expand Up @@ -5439,7 +5441,9 @@ static BoundNode bindSpreadElement(SpreadElementSyntax syntax, BindingDiagnostic
static (BoundUnconvertedWithElement? withElement, BoundBadExpression? badExpression) bindWithElement(
Binder @this,
CollectionExpressionSyntax syntax,
#pragma warning disable RSEXPERIMENTAL006 // With Element: https://github.com/dotnet/roslyn/issues/80613
WithElementSyntax withElementSyntax,
#pragma warning restore RSEXPERIMENTAL006
BindingDiagnosticBag diagnostics)
{
// Report a withElement that is not first. Note: for the purposes of error recovery and diagnostics
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2 changes: 2 additions & 0 deletions src/Compilers/CSharp/Portable/BoundTree/BoundExpression.cs
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Expand Up @@ -23,7 +23,9 @@ public SimpleNameSyntax? InterceptableNameSyntax
this.Syntax is InvocationExpressionSyntax
or ConstructorInitializerSyntax
or PrimaryConstructorBaseTypeSyntax { ArgumentList: { } }
#pragma warning disable RSEXPERIMENTAL006 // With Element: https://github.com/dotnet/roslyn/issues/80613
or WithElementSyntax
#pragma warning restore RSEXPERIMENTAL006
or CollectionExpressionSyntax,
$"Unexpected syntax kind for BoundCall: {this.Syntax.Kind()}");

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6 changes: 6 additions & 0 deletions src/Compilers/CSharp/Portable/Compilation/CSharpSemanticModel.cs
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Expand Up @@ -8,6 +8,7 @@
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Threading;
using Microsoft.CodeAnalysis.Collections;
Expand Down Expand Up @@ -122,7 +123,9 @@ internal static bool CanGetSemanticInfo(CSharpSyntaxNode node, bool allowNamedAr
(node is ExpressionSyntax && (isSpeculative || allowNamedArgumentName || !SyntaxFacts.IsNamedArgumentName(node))) ||
(node is ConstructorInitializerSyntax
or PrimaryConstructorBaseTypeSyntax
#pragma warning disable RSEXPERIMENTAL006 // With Element: https://github.com/dotnet/roslyn/issues/80613
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@jcouv jcouv Jan 24, 2026 •
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Could we instead suppress this warning globally within the compiler codebase?
That would avoid sprinkling of suppressions and would make it much easier for the PR that adds a new LangVer #Closed

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@333fred 333fred Jan 26, 2026 •
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No. The non-suppressed global warning helped me catch manually-written public APIs that also need to be marked as Experimental. We could consider suppressing it in test projects/IDE, but I very much do not think we should do so in the main compiler codebase.

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@AlekseyTs AlekseyTs Jan 28, 2026

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The non-suppressed global warning helped me catch manually-written public APIs that also need to be marked as Experimental.

How exactly did that help you?

or WithElementSyntax
#pragma warning restore RSEXPERIMENTAL006
or AttributeSyntax
or CrefSyntax);
}
Expand Down Expand Up @@ -657,6 +660,7 @@ private static SymbolInfo GetSymbolInfoFromSymbolOrNone(ITypeSymbol type)
/// <summary>
/// Returns what symbol(s), if any, the given 'with(...)' element syntax bound to in the program.
/// </summary>
[Experimental(RoslynExperiments.PreviewLanguageFeatureApi, UrlFormat = "https://github.com/dotnet/roslyn/issues/80613")]
internal SymbolInfo GetSymbolInfo(WithElementSyntax withElement, CancellationToken cancellationToken = default(CancellationToken))
{
CheckSyntaxNode(withElement);
Expand Down Expand Up @@ -5021,8 +5025,10 @@ private SymbolInfo GetSymbolInfoFromNode(SyntaxNode node, CancellationToken canc
return this.GetSymbolInfo(orderingSyntax, cancellationToken);
case PositionalPatternClauseSyntax ppcSyntax:
return this.GetSymbolInfo(ppcSyntax, cancellationToken);
#pragma warning disable RSEXPERIMENTAL006 // With Element: https://github.com/dotnet/roslyn/issues/80613
case WithElementSyntax withElement:
return this.GetSymbolInfo(withElement, cancellationToken);
#pragma warning restore RSEXPERIMENTAL006
}

return SymbolInfo.None;
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2 changes: 2 additions & 0 deletions src/Compilers/CSharp/Portable/Compilation/MemberSemanticModel.cs
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Expand Up @@ -2291,7 +2291,9 @@ protected internal virtual CSharpSyntaxNode GetBindableSyntaxNode(CSharpSyntaxNo
!(node is JoinIntoClauseSyntax) &&
!(node is QueryContinuationSyntax) &&
!(node is ConstructorInitializerSyntax) &&
#pragma warning disable RSEXPERIMENTAL006 // With Element: https://github.com/dotnet/roslyn/issues/80613
!(node is WithElementSyntax) &&
#pragma warning restore RSEXPERIMENTAL006
!(node is PrimaryConstructorBaseTypeSyntax) &&
!(node is ArrowExpressionClauseSyntax) &&
!(node is PatternSyntax))
Expand Down
1 change: 1 addition & 0 deletions ...arpSyntaxGenerator/CSharpSyntaxGenerator.SourceGenerator/Syntax.xml.Internal.Generated.cs
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@@ -1,6 +1,7 @@
// <auto-generated />

#nullable enable
#pragma warning disable RSEXPERIMENTAL006 // Preview language feature API

using System;
using System.Collections.Generic;
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6 changes: 6 additions & 0 deletions .../CSharpSyntaxGenerator/CSharpSyntaxGenerator.SourceGenerator/Syntax.xml.Main.Generated.cs
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@@ -1,6 +1,7 @@
// <auto-generated />

#nullable enable
#pragma warning disable RSEXPERIMENTAL006 // Preview language feature API

using System;
using System.Collections.Generic;
Expand Down Expand Up @@ -229,6 +230,7 @@ public partial class CSharpSyntaxVisitor<TResult>
public virtual TResult? VisitSpreadElement(SpreadElementSyntax node) => this.DefaultVisit(node);

/// <summary>Called when the visitor visits a WithElementSyntax node.</summary>
[Experimental(global::Microsoft.CodeAnalysis.RoslynExperiments.PreviewLanguageFeatureApi, UrlFormat = @"https://github.com/dotnet/roslyn/issues/80613")]
public virtual TResult? VisitWithElement(WithElementSyntax node) => this.DefaultVisit(node);

/// <summary>Called when the visitor visits a QueryExpressionSyntax node.</summary>
Expand Down Expand Up @@ -976,6 +978,7 @@ public partial class CSharpSyntaxVisitor
public virtual void VisitSpreadElement(SpreadElementSyntax node) => this.DefaultVisit(node);

/// <summary>Called when the visitor visits a WithElementSyntax node.</summary>
[Experimental(global::Microsoft.CodeAnalysis.RoslynExperiments.PreviewLanguageFeatureApi, UrlFormat = @"https://github.com/dotnet/roslyn/issues/80613")]
public virtual void VisitWithElement(WithElementSyntax node) => this.DefaultVisit(node);

/// <summary>Called when the visitor visits a QueryExpressionSyntax node.</summary>
Expand Down Expand Up @@ -1722,6 +1725,7 @@ public partial class CSharpSyntaxRewriter : CSharpSyntaxVisitor<SyntaxNode?>
public override SyntaxNode? VisitSpreadElement(SpreadElementSyntax node)
=> node.Update(VisitToken(node.OperatorToken), (ExpressionSyntax?)Visit(node.Expression) ?? throw new ArgumentNullException("expression"));

[Experimental(global::Microsoft.CodeAnalysis.RoslynExperiments.PreviewLanguageFeatureApi, UrlFormat = @"https://github.com/dotnet/roslyn/issues/80613")]
public override SyntaxNode? VisitWithElement(WithElementSyntax node)
=> node.Update(VisitToken(node.WithKeyword), (ArgumentListSyntax?)Visit(node.ArgumentList) ?? throw new ArgumentNullException("argumentList"));

Expand Down Expand Up @@ -3446,6 +3450,7 @@ public static SpreadElementSyntax SpreadElement(ExpressionSyntax expression)
=> SyntaxFactory.SpreadElement(SyntaxFactory.Token(SyntaxKind.DotDotToken), expression);

/// <summary>Creates a new WithElementSyntax instance.</summary>
[Experimental(global::Microsoft.CodeAnalysis.RoslynExperiments.PreviewLanguageFeatureApi, UrlFormat = @"https://github.com/dotnet/roslyn/issues/80613")]
public static WithElementSyntax WithElement(SyntaxToken withKeyword, ArgumentListSyntax argumentList)
{
if (withKeyword.Kind() != SyntaxKind.WithKeyword) throw new ArgumentException(nameof(withKeyword));
Expand All @@ -3454,6 +3459,7 @@ public static WithElementSyntax WithElement(SyntaxToken withKeyword, ArgumentLis
}

/// <summary>Creates a new WithElementSyntax instance.</summary>
[Experimental(global::Microsoft.CodeAnalysis.RoslynExperiments.PreviewLanguageFeatureApi, UrlFormat = @"https://github.com/dotnet/roslyn/issues/80613")]
public static WithElementSyntax WithElement(ArgumentListSyntax? argumentList = default)
=> SyntaxFactory.WithElement(SyntaxFactory.Token(SyntaxKind.WithKeyword), argumentList ?? SyntaxFactory.ArgumentList());

Expand Down
2 changes: 2 additions & 0 deletions ...SharpSyntaxGenerator/CSharpSyntaxGenerator.SourceGenerator/Syntax.xml.Syntax.Generated.cs
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@@ -1,6 +1,7 @@
// <auto-generated />

#nullable enable
#pragma warning disable RSEXPERIMENTAL006 // Preview language feature API

using System;
using System.Collections.Generic;
Expand Down Expand Up @@ -4279,6 +4280,7 @@ public SpreadElementSyntax Update(SyntaxToken operatorToken, ExpressionSyntax ex
/// <item><description><see cref="SyntaxKind.WithElement"/></description></item>
/// </list>
/// </remarks>
[Experimental(global::Microsoft.CodeAnalysis.RoslynExperiments.PreviewLanguageFeatureApi, UrlFormat = @"https://github.com/dotnet/roslyn/issues/80613")]
public sealed partial class WithElementSyntax : CollectionElementSyntax
{
private ArgumentListSyntax? argumentList;
Expand Down
28 changes: 14 additions & 14 deletions src/Compilers/CSharp/Portable/PublicAPI.Unshipped.txt
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Expand Up @@ -3,17 +3,17 @@ Microsoft.CodeAnalysis.CSharp.ForEachStatementInfo.MoveNextAwaitableInfo.get ->
Microsoft.CodeAnalysis.CSharp.SyntaxKind.WithElement = 9081 -> Microsoft.CodeAnalysis.CSharp.SyntaxKind
static Microsoft.CodeAnalysis.CSharp.CSharpExtensions.GetAwaitExpressionInfo(this Microsoft.CodeAnalysis.SemanticModel? semanticModel, Microsoft.CodeAnalysis.CSharp.Syntax.LocalDeclarationStatementSyntax! awaitUsingDeclaration) -> Microsoft.CodeAnalysis.CSharp.AwaitExpressionInfo
static Microsoft.CodeAnalysis.CSharp.CSharpExtensions.GetAwaitExpressionInfo(this Microsoft.CodeAnalysis.SemanticModel? semanticModel, Microsoft.CodeAnalysis.CSharp.Syntax.UsingStatementSyntax! awaitUsingStatement) -> Microsoft.CodeAnalysis.CSharp.AwaitExpressionInfo
Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax
Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax.AddArgumentListArguments(params Microsoft.CodeAnalysis.CSharp.Syntax.ArgumentSyntax![]! items) -> Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax!
Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax.ArgumentList.get -> Microsoft.CodeAnalysis.CSharp.Syntax.ArgumentListSyntax!
Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax.Update(Microsoft.CodeAnalysis.SyntaxToken withKeyword, Microsoft.CodeAnalysis.CSharp.Syntax.ArgumentListSyntax! argumentList) -> Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax!
Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax.WithArgumentList(Microsoft.CodeAnalysis.CSharp.Syntax.ArgumentListSyntax! argumentList) -> Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax!
Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax.WithKeyword.get -> Microsoft.CodeAnalysis.SyntaxToken
Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax.WithWithKeyword(Microsoft.CodeAnalysis.SyntaxToken withKeyword) -> Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax!
override Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitWithElement(Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax! node) -> Microsoft.CodeAnalysis.SyntaxNode?
override Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax.Accept(Microsoft.CodeAnalysis.CSharp.CSharpSyntaxVisitor! visitor) -> void
override Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax.Accept<TResult>(Microsoft.CodeAnalysis.CSharp.CSharpSyntaxVisitor<TResult>! visitor) -> TResult?
static Microsoft.CodeAnalysis.CSharp.SyntaxFactory.WithElement(Microsoft.CodeAnalysis.CSharp.Syntax.ArgumentListSyntax? argumentList = null) -> Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax!
static Microsoft.CodeAnalysis.CSharp.SyntaxFactory.WithElement(Microsoft.CodeAnalysis.SyntaxToken withKeyword, Microsoft.CodeAnalysis.CSharp.Syntax.ArgumentListSyntax! argumentList) -> Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax!
virtual Microsoft.CodeAnalysis.CSharp.CSharpSyntaxVisitor.VisitWithElement(Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax! node) -> void
virtual Microsoft.CodeAnalysis.CSharp.CSharpSyntaxVisitor<TResult>.VisitWithElement(Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax! node) -> TResult?
[RSEXPERIMENTAL006]Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax
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@jcouv jcouv Jan 29, 2026 •
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Should the SyntaxKind above bet considered experimental too? #Closed

[RSEXPERIMENTAL006]Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax.AddArgumentListArguments(params Microsoft.CodeAnalysis.CSharp.Syntax.ArgumentSyntax![]! items) -> Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax!
[RSEXPERIMENTAL006]Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax.ArgumentList.get -> Microsoft.CodeAnalysis.CSharp.Syntax.ArgumentListSyntax!
[RSEXPERIMENTAL006]Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax.Update(Microsoft.CodeAnalysis.SyntaxToken withKeyword, Microsoft.CodeAnalysis.CSharp.Syntax.ArgumentListSyntax! argumentList) -> Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax!
[RSEXPERIMENTAL006]Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax.WithArgumentList(Microsoft.CodeAnalysis.CSharp.Syntax.ArgumentListSyntax! argumentList) -> Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax!
[RSEXPERIMENTAL006]Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax.WithKeyword.get -> Microsoft.CodeAnalysis.SyntaxToken
[RSEXPERIMENTAL006]Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax.WithWithKeyword(Microsoft.CodeAnalysis.SyntaxToken withKeyword) -> Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax!
[RSEXPERIMENTAL006]override Microsoft.CodeAnalysis.CSharp.CSharpSyntaxRewriter.VisitWithElement(Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax! node) -> Microsoft.CodeAnalysis.SyntaxNode?
[RSEXPERIMENTAL006]override Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax.Accept(Microsoft.CodeAnalysis.CSharp.CSharpSyntaxVisitor! visitor) -> void
[RSEXPERIMENTAL006]override Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax.Accept<TResult>(Microsoft.CodeAnalysis.CSharp.CSharpSyntaxVisitor<TResult>! visitor) -> TResult?
[RSEXPERIMENTAL006]static Microsoft.CodeAnalysis.CSharp.SyntaxFactory.WithElement(Microsoft.CodeAnalysis.CSharp.Syntax.ArgumentListSyntax? argumentList = null) -> Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax!
[RSEXPERIMENTAL006]static Microsoft.CodeAnalysis.CSharp.SyntaxFactory.WithElement(Microsoft.CodeAnalysis.SyntaxToken withKeyword, Microsoft.CodeAnalysis.CSharp.Syntax.ArgumentListSyntax! argumentList) -> Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax!
[RSEXPERIMENTAL006]virtual Microsoft.CodeAnalysis.CSharp.CSharpSyntaxVisitor.VisitWithElement(Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax! node) -> void
[RSEXPERIMENTAL006]virtual Microsoft.CodeAnalysis.CSharp.CSharpSyntaxVisitor<TResult>.VisitWithElement(Microsoft.CodeAnalysis.CSharp.Syntax.WithElementSyntax! node) -> TResult?
2 changes: 1 addition & 1 deletion src/Compilers/CSharp/Portable/Syntax/Syntax.xml
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Expand Up @@ -1839,7 +1839,7 @@
</Field>
<Field Name="Expression" Type="ExpressionSyntax" />
</Node>
<Node Name="WithElementSyntax" Base="CollectionElementSyntax">
<Node Name="WithElementSyntax" Base="CollectionElementSyntax" Experimental="https://github.com/dotnet/roslyn/issues/80613">
<Kind Name="WithElement"/>
<Field Name="WithKeyword" Type="SyntaxToken">
<Kind Name="WithKeyword"/>
Expand Down
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