[main] Bump Microsoft.CodeAnalysis.Analyzers and Microsoft.CodeAnalysis.Common

[dependabot]

Updated Microsoft.CodeAnalysis.Analyzers from 5.6.0 to 5.9.0-1.26328.17.

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Updated Microsoft.CodeAnalysis.Common from 3.11.0 to 5.9.0.

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5.0.4

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5.0.2

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• Core

5.0.1

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• Core

4.2.0-4.22266.5

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4.2.0-3.22151.16

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4.2.0-1.22108.11

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4.0.0-2.21354.7

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4.0.0-2.21254.26

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4.0.0-1.21277.15

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[Copilot]

Pull request overview

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Updates Roslyn-related package versions in central package management to newer releases.

Changes:

• Bumps MicrosoftCodeAnalysisVersion from 3.11.0 to 5.9.0
• Updates Microsoft.CodeAnalysis.Analyzers package version to a 5.9.0-* build

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[github-actions]

🔍 Build Failure Analysis

Summary — Bumping Microsoft.CodeAnalysis 3.11.0→5.9.0 and Microsoft.CodeAnalysis.Analyzers 5.6.0→5.9.0-1.26328.17 breaks the build in two independent ways: the new Roslyn IDE analyzers now flag existing MSTest.Analyzers source with IDE0303 errors (Linux/macOS legs), and the newer Microsoft.CodeAnalysis.CSharp API changed overload resolution for a generic method used in MSTest.Analyzers.CodeFixes, breaking compilation (Windows legs).

Root cause 1: IDE0303 promoted to error across MSTest.Analyzers (Linux + macOS legs)

The upgraded Microsoft.CodeAnalysis toolchain ships/enables a newer built-in IDE analyzer set. IDE0303 ("Collection initialization can be simplified") now fires on ~25 analyzer source files that use ImmutableArray.Create(Rule) instead of collection-expression syntax ([Rule]), and the repo's ruleset treats these as build errors. This is a repo-wide style violation surfaced only by the new analyzer version, not a logic bug.

Affected files / errors (25 files × 2 diagnostics each; representative sample)

• src/Analyzers/MSTest.Analyzers/AssemblyCleanupShouldBeValidAnalyzer.cs:29 — IDE0303: Collection initialization can be simplified
• src/Analyzers/MSTest.Analyzers/AssemblyFixtureProviderNotSupportedWithNativeAotAnalyzer.cs:37 — same
• ...and ~23 more analyzer files (AssemblyInitializeShouldBeValidAnalyzer.cs, PreferDisposeOverTestCleanupAnalyzer.cs, TestMethodShouldBeValidAnalyzer.cs, PublicTypeShouldBeTestClassAnalyzer.cs, etc.)

Proposed fix — replace ImmutableArray.Create(Rule) initializers with the collection-expression form:

-    public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics { get; } = ImmutableArray.Create(Rule);
+    public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics { get; } = [Rule];

Given the number of affected files (~25), this is best applied as a mechanical find-and-replace across src/Analyzers/MSTest.Analyzers/*.cs (or via dotnet format since IDE0303 is fixer-eligible) rather than via individual suggestions.

Root cause 2: CS1503 in FixtureMethodFixer.cs — SeparatedList<SyntaxNode> no longer implicitly convertible (Windows legs)

Microsoft.CodeAnalysis.CSharp's SyntaxFactory.SeparatedList<TNode> overload resolution changed between 3.11.0 and 5.9.0: SyntaxFactory.SeparatedList(GetParameters(...)), where GetParameters returns IEnumerable<SyntaxNode>, now resolves to SeparatedList<SyntaxNode> instead of inferring SeparatedList<ParameterSyntax>, so the result can no longer be passed to SyntaxFactory.ParameterList(SeparatedList<ParameterSyntax>).

Affected files / errors

• src/Analyzers/MSTest.Analyzers.CodeFixes/Helpers/FixtureMethodFixer.cs:39 — CS1503: Argument 1: cannot convert from 'SeparatedSyntaxList<SyntaxNode>' to 'SeparatedSyntaxList<ParameterSyntax>'

Proposed fix — make the type parameter explicit so overload resolution isn't ambiguous:

         fixedMethodDeclarationNode = ((MethodDeclarationSyntax)fixedMethodDeclarationNode)
             .WithParameterList(
                 SyntaxFactory.ParameterList(
-                    SyntaxFactory.SeparatedList(
+                    SyntaxFactory.SeparatedList<ParameterSyntax>(
                         GetParameters(syntaxGenerator, isParameterLess, wellKnownTypeProvider))))

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Build overview

• Linux Debug — FAILED, 189 errors (mostly IDE0303), MSBuild 18.11.0-1.26402.102
• Windows Debug — FAILED, 2 errors (CS1503 in MSTest.Analyzers.CodeFixes.csproj + cascading "Build failed."), MSBuild 18.7.1
• Windows/macOS Release legs show the same CS1503 failure; Linux Release and macOS Debug/Release show the same IDE0303 pattern.
• Root cause 1 (IDE0303) and root cause 2 (CS1503) are independent — both must be fixed for all 7 legs to pass.

Sample MSBuild errors

Code	Project	File:Line	Message
IDE0303	MSTest.Analyzers	AssemblyCleanupShouldBeValidAnalyzer.cs:29	Collection initialization can be simplified
IDE0303	MSTest.Analyzers	AssemblyFixtureProviderNotSupportedWithNativeAotAnalyzer.cs:37	Collection initialization can be simplified
CS1503	MSTest.Analyzers.CodeFixes	FixtureMethodFixer.cs:39	Argument 1: cannot convert SeparatedSyntaxList<SyntaxNode> to SeparatedSyntaxList<ParameterSyntax>

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_{🤖 Generated by the Build Failure Analysis workflow using binlog-mcp · commit a8bbffe}

🤖 Automated content by GitHub Copilot. Generated by the Build Failure Analysis workflow. · auto · 118.4 AIC · ⌖ 2.08 AIC · ⊞ 11.6K · [◷]( · ◷)

[github-actions]

🤖 Automated content by GitHub Copilot. Generated by the Build Failure Analysis workflow. · auto · 118.4 AIC · ⌖ 2.08 AIC · ⊞ 11.6K · ◷

[github-actions]

🔧 CS1503/IDE0303 — Bumping Microsoft.CodeAnalysis.Analyzers/Microsoft.CodeAnalysis.Common to 5.9.0 breaks the build: newer built-in IDE0303 diagnostics fire as errors across ~25 files in src/Analyzers/MSTest.Analyzers/*.cs (e.g. ImmutableArray.Create(Rule) → [Rule]), and SyntaxFactory.SeparatedList overload resolution changes cause a CS1503 in src/Analyzers/MSTest.Analyzers.CodeFixes/Helpers/FixtureMethodFixer.cs:39. See the summary comment for proposed fixes to both.