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merged 2 commits into from
Aug 21, 2025
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Add RuntimeAwaitMethod to AwaitExpressionInfo #79968

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Add RuntimeAwaitMethod to AwaitExpressionInfo
333fred Aug 19, 2025
e1be433
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333fred Aug 19, 2025
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25 changes: 22 additions & 3 deletions src/Compilers/CSharp/Portable/Compilation/AwaitExpressionInfo.cs
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Expand Up @@ -10,7 +10,6 @@ namespace Microsoft.CodeAnalysis.CSharp
/// <summary>
/// Structure containing all semantic information about an await expression.
/// </summary>
// https://github.com/dotnet/roslyn/issues/79818: Add runtime async info
public readonly struct AwaitExpressionInfo : IEquatable<AwaitExpressionInfo>
{
public IMethodSymbol? GetAwaiterMethod { get; }
Expand All @@ -21,11 +20,30 @@ namespace Microsoft.CodeAnalysis.CSharp

public bool IsDynamic { get; }

internal AwaitExpressionInfo(IMethodSymbol getAwaiter, IPropertySymbol isCompleted, IMethodSymbol getResult, bool isDynamic)
/// <summary>
/// When runtime async is enabled for this await expression, this represents either:
/// <list type="bullet">
/// <item>
/// A call to <c>System.Runtime.CompilerServices.AsyncHelpers.Await</c>, if this is a
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@jcouv jcouv Aug 22, 2025

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This is not a "call", it's a method symbol

/// supported task type. In such cases, <see cref="GetAwaiterMethod" />,
/// <see cref="IsCompletedProperty" />, and <see cref="GetResultMethod" /> will be
/// <see langword="null" />.
/// </item>
/// <item>
/// A call to <c>System.Runtime.CompilerServices.AsyncHelpers.AwaitAwaiter|UnsafeAwaitAwaiter</c>.
/// In these cases, the other properties may be non-<see langword="null" /> if the
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@jcouv jcouv Aug 22, 2025 •
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I assume you mean that GetAwaiterMethod/IsCompletedProperty/GetResultMethod may be set in runtime-async scenario. Looking at the logic in GetAwaitableExpressionInfo, we don't set those in runtime-async scenario (since we won't need them). Why not make this behavior official in the public API? The behavior we have seems better than the behavior this comment describes. #Closed

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@333fred 333fred Aug 22, 2025

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Looking at the logic in GetAwaitableExpressionInfo, we don't set those in runtime-async scenario (since we won't need them).

We do set them in this case, because we will need them.

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@jcouv jcouv Aug 22, 2025

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Yup, I misread. We don't need the other members for System.Runtime.CompilerServices.AsyncHelpers.Await case, but we do need them for the AwaitAwiter/UnsafeAwaitAwaiter cases. Thanks

/// the rest of the await expression is successfully bound.
/// </item>
/// </list>
/// </summary>
public IMethodSymbol? RuntimeAwaitMethod { get; }

internal AwaitExpressionInfo(IMethodSymbol? getAwaiter, IPropertySymbol? isCompleted, IMethodSymbol? getResult, IMethodSymbol? runtimeAwaitMethod, bool isDynamic)
{
GetAwaiterMethod = getAwaiter;
IsCompletedProperty = isCompleted;
GetResultMethod = getResult;
RuntimeAwaitMethod = runtimeAwaitMethod;
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@jcouv jcouv Aug 22, 2025 •
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Consider asserting that we either set runtimeAwaitMethod or the members related to non-runtime-async #Closed

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@333fred 333fred Aug 22, 2025

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This is not a thing that can be asserted.

IsDynamic = isDynamic;
}

Expand All @@ -39,12 +57,13 @@ public bool Equals(AwaitExpressionInfo other)
return object.Equals(this.GetAwaiterMethod, other.GetAwaiterMethod)
&& object.Equals(this.IsCompletedProperty, other.IsCompletedProperty)
&& object.Equals(this.GetResultMethod, other.GetResultMethod)
&& object.Equals(this.RuntimeAwaitMethod, other.RuntimeAwaitMethod)
&& IsDynamic == other.IsDynamic;
}

public override int GetHashCode()
{
return Hash.Combine(GetAwaiterMethod, Hash.Combine(IsCompletedProperty, Hash.Combine(GetResultMethod, IsDynamic.GetHashCode())));
return Hash.Combine(GetAwaiterMethod, Hash.Combine(IsCompletedProperty, Hash.Combine(GetResultMethod, Hash.Combine(RuntimeAwaitMethod, IsDynamic.GetHashCode()))));
}
}
}
1 change: 1 addition & 0 deletions src/Compilers/CSharp/Portable/Compilation/MemberSemanticModel.cs
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Expand Up @@ -931,6 +931,7 @@ public override AwaitExpressionInfo GetAwaitExpressionInfo(AwaitExpressionSyntax
getAwaiter: (IMethodSymbol)awaitableInfo.GetAwaiter?.ExpressionSymbol.GetPublicSymbol(),
isCompleted: awaitableInfo.IsCompleted.GetPublicSymbol(),
getResult: awaitableInfo.GetResult.GetPublicSymbol(),
runtimeAwaitMethod: awaitableInfo.RuntimeAsyncAwaitCall?.Method.GetPublicSymbol(),
isDynamic: awaitableInfo.IsDynamic);
}

Expand Down
1 change: 1 addition & 0 deletions src/Compilers/CSharp/Portable/PublicAPI.Unshipped.txt
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@@ -1,4 +1,5 @@
abstract Microsoft.CodeAnalysis.CSharp.InterceptableLocation.Equals(Microsoft.CodeAnalysis.CSharp.InterceptableLocation? other) -> bool
Microsoft.CodeAnalysis.CSharp.AwaitExpressionInfo.RuntimeAwaitMethod.get -> Microsoft.CodeAnalysis.IMethodSymbol?
Microsoft.CodeAnalysis.CSharp.LanguageVersion.CSharp14 = 1400 -> Microsoft.CodeAnalysis.CSharp.LanguageVersion
Microsoft.CodeAnalysis.CSharp.Syntax.ExtensionBlockDeclarationSyntax
Microsoft.CodeAnalysis.CSharp.Syntax.ExtensionBlockDeclarationSyntax.AddAttributeLists(params Microsoft.CodeAnalysis.CSharp.Syntax.AttributeListSyntax![]! items) -> Microsoft.CodeAnalysis.CSharp.Syntax.ExtensionBlockDeclarationSyntax!
Expand Down
62 changes: 31 additions & 31 deletions src/Compilers/CSharp/Test/Emit/CodeGen/CodeGenAsyncEHTests.cs
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Expand Up @@ -144,7 +144,7 @@ public static void Main()
var expected = @"";
CompileAndVerify(source, expectedOutput: expected);

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true), verify: Verification.FailsPEVerify);
verifier.VerifyDiagnostics(
// (3,1): hidden CS8019: Unnecessary using directive.
Expand Down Expand Up @@ -579,7 +579,7 @@ .locals init (int V_0,
}
");

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true),
verify: Verification.Fails with
{
Expand Down Expand Up @@ -628,7 +628,7 @@ public static async Task<T> Goo<T>() where T : Exception
";
CompileAndVerify(source, expectedOutput: "3");

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput("3", isRuntimeAsync: true), verify: Verification.Fails with
{
ILVerifyMessage = """
Expand Down Expand Up @@ -677,7 +677,7 @@ public static void Main()
";
CompileAndVerify(source, expectedOutput: expected);

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(
comp,
expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true),
Expand Down Expand Up @@ -731,7 +731,7 @@ public static void Main()
";
CompileAndVerify(source, expectedOutput: expected);

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true), verify: Verification.Fails with
{
ILVerifyMessage = """
Expand Down Expand Up @@ -894,7 +894,7 @@ .locals init (int V_0,
}
");

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true),
verify: Verification.Fails with
{
Expand Down Expand Up @@ -1000,7 +1000,7 @@ public static void Main()

CompileAndVerify(source, expectedOutput: expected);

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true), verify: Verification.Fails with
{
ILVerifyMessage = """
Expand Down Expand Up @@ -1359,7 +1359,7 @@ .locals init (int V_0,
IL_01cc: ret
}", sequencePoints: "Test+<G>d__1.MoveNext");

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true), verify: Verification.Fails with
{
ILVerifyMessage = """
Expand Down Expand Up @@ -1479,7 +1479,7 @@ public static void Main()
";
CompileAndVerify(source, expectedOutput: expected);

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true),
verify: Verification.Fails with
{
Expand Down Expand Up @@ -1765,7 +1765,7 @@ .locals init (int V_0,
}
""");

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true), verify: Verification.Fails with
{
ILVerifyMessage = """
Expand Down Expand Up @@ -2043,7 +2043,7 @@ .locals init (int V_0,
}
""");

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true), verify: Verification.Fails with
{
ILVerifyMessage = """
Expand Down Expand Up @@ -2296,7 +2296,7 @@ .locals init (int V_0,
}
""");

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true), verify: Verification.Fails with
{
ILVerifyMessage = """
Expand Down Expand Up @@ -2377,7 +2377,7 @@ public static void Main()
var expected = "4";
CompileAndVerify(source, expected);

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true), verify: Verification.Fails with
{
ILVerifyMessage = """
Expand Down Expand Up @@ -2504,7 +2504,7 @@ public static void Main()
var expected = @"15";
CompileAndVerify(source, expectedOutput: expected);

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true),
verify: Verification.Fails with
{
Expand Down Expand Up @@ -2592,7 +2592,7 @@ public static void Main()
15";
CompileAndVerify(source, expectedOutput: expected);

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true),
verify: Verification.Fails with
{
Expand Down Expand Up @@ -2684,7 +2684,7 @@ public static void Main()
15";
CompileAndVerify(source, expectedOutput: expected);

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true),
verify: Verification.Fails with
{
Expand Down Expand Up @@ -2847,7 +2847,7 @@ .locals init (int V_0,
}
");

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(
comp,
expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true),
Expand Down Expand Up @@ -2964,7 +2964,7 @@ Attempted to divide by zero.
";
CompileAndVerify(source, expectedOutput: expected);

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true),
verify: Verification.Fails with
{
Expand Down Expand Up @@ -3044,7 +3044,7 @@ Attempted to divide by zero.
";
CompileAndVerify(source, expectedOutput: expected);

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true),
verify: Verification.Fails with
{
Expand Down Expand Up @@ -3129,7 +3129,7 @@ Attempted to divide by zero.
";
CompileAndVerify(source, expectedOutput: expected);

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true),
verify: Verification.Fails with
{
Expand Down Expand Up @@ -3194,7 +3194,7 @@ public static void Main()
";
CompileAndVerify(source, expectedOutput: expected);

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true),
verify: Verification.Fails with
{
Expand Down Expand Up @@ -3374,7 +3374,7 @@ public static void Main()
";
CompileAndVerify(source, expectedOutput: expected);

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true),
verify: Verification.Fails with
{
Expand Down Expand Up @@ -3466,7 +3466,7 @@ public static void Main()
";
CompileAndVerify(source, expectedOutput: expected);

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true),
verify: Verification.Fails with
{
Expand Down Expand Up @@ -3561,7 +3561,7 @@ public static void Main()
";
CompileAndVerify(source, expectedOutput: expected);

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true),
verify: Verification.Fails with
{
Expand Down Expand Up @@ -3608,7 +3608,7 @@ static void Main()
";
CompileAndVerify(source, expected);

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(
comp,
expectedOutput: CodeGenAsyncTests.ExpectedOutput(expected, isRuntimeAsync: true),
Expand Down Expand Up @@ -3686,7 +3686,7 @@ async Task M2(string caller, Exception ex)
CompileAndVerify(source, options: TestOptions.DebugExe, expectedOutput: expectedOutput).VerifyDiagnostics();
CompileAndVerify(source, options: TestOptions.ReleaseExe, expectedOutput: expectedOutput).VerifyDiagnostics();

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expectedOutput, isRuntimeAsync: true),
verify: Verification.Fails with
{
Expand Down Expand Up @@ -3797,7 +3797,7 @@ async Task M2(string caller, Exception ex)
CompileAndVerify(source, options: TestOptions.DebugExe, expectedOutput: expectedOutput).VerifyDiagnostics();
CompileAndVerify(source, options: TestOptions.ReleaseExe, expectedOutput: expectedOutput).VerifyDiagnostics();

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expectedOutput, isRuntimeAsync: true),
verify: Verification.Fails with
{
Expand Down Expand Up @@ -3895,7 +3895,7 @@ async Task M2(string caller, Exception ex)
[M2]: Return value missing on the stack. { Offset = 0x3f }
""";

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expectedOutput, isRuntimeAsync: true), verify: Verification.Fails with { ILVerifyMessage = ilVerifyMessage });
verifier.VerifyDiagnostics();
}
Expand Down Expand Up @@ -3979,7 +3979,7 @@ class Exception2 : Exception { }
CompileAndVerify(source, options: TestOptions.ReleaseExe, expectedOutput: expectedOutput,
targetFramework: TargetFramework.Mscorlib46).VerifyDiagnostics();

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var ilVerifyMessage = (await1, await2) switch
{
(true, true) => """
Expand Down Expand Up @@ -4064,7 +4064,7 @@ class Exception3 : Exception { }
CompileAndVerify(source, options: TestOptions.DebugExe, expectedOutput: expectedOutput).VerifyDiagnostics();
CompileAndVerify(source, options: TestOptions.ReleaseExe, expectedOutput: expectedOutput).VerifyDiagnostics();

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expectedOutput, isRuntimeAsync: true), verify: Verification.Fails with
{
ILVerifyMessage = "[<Main>$]: Return value missing on the stack. { Offset = 0x1d }"
Expand Down Expand Up @@ -4779,7 +4779,7 @@ public async IAsyncEnumerator<int> GetAsyncEnumerator(CancellationToken ct)
CompileAndVerify(CreateCompilationWithTasksExtensions(sources, options: TestOptions.DebugExe), expectedOutput: expectedOutput).VerifyDiagnostics();
CompileAndVerify(CreateCompilationWithTasksExtensions(sources, options: TestOptions.ReleaseExe), expectedOutput: expectedOutput).VerifyDiagnostics();

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
var verifier = CompileAndVerify(comp, expectedOutput: CodeGenAsyncTests.ExpectedOutput(expectedOutput, isRuntimeAsync: true), verify: Verification.Skipped);
verifier.VerifyDiagnostics();

Expand Down
2 changes: 1 addition & 1 deletion src/Compilers/CSharp/Test/Emit/CodeGen/CodeGenAsyncLocalsTests.cs
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Expand Up @@ -481,7 +481,7 @@ public static void Main()
";
CompileAndVerify(source, expectedOutput: expected, references: new[] { CSharpRef });

var comp = CodeGenAsyncTests.CreateRuntimeAsyncCompilation(source);
var comp = CreateRuntimeAsyncCompilation(source);
comp.VerifyEmitDiagnostics(
// (9,16): error CS9328: Method 'Test.F(dynamic)' uses a feature that is not supported by runtime async currently. Opt the method out of runtime async by attributing it with 'System.Runtime.CompilerServices.RuntimeAsyncMethodGenerationAttribute(false)'.
// return await t;
Expand Down
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