Fix issue with dynamic runtime binding in Microsoft.CSharp test (#117705)

Copilot · akoeplinger · MichalStrehovsky · web-flow · commit 4b9767637c88 · 2025-07-17T12:30:53.000+02:00
Fix dynamic binding issue in Microsoft.CSharp tests by casting dynamic parameter to object

Co-authored-by: MichalStrehovsky &lt;13110571+MichalStrehovsky@users.noreply.github.com&gt;

---------

Co-authored-by: copilot-swe-agent[bot] &lt;198982749+Copilot@users.noreply.github.com&gt;
Co-authored-by: akoeplinger &lt;1376924+akoeplinger@users.noreply.github.com&gt;
Co-authored-by: MichalStrehovsky &lt;13110571+MichalStrehovsky@users.noreply.github.com&gt;
diff --git a/src/libraries/Microsoft.CSharp/tests/AssignmentTests.cs b/src/libraries/Microsoft.CSharp/tests/AssignmentTests.cs
@@ -83,7 +83,7 @@ public void AddAssignment(dynamic lhs, dynamic rhs, object expected)
         {
             lhs += rhs;
             Assert.Equal(expected, lhs);
-            Assert.IsType(expected.GetType(), lhs);
+            Assert.IsType(expected.GetType(), (object)lhs);
         }
 
         [Theory, MemberData(nameof(PropertyAdditions))]
diff --git a/src/libraries/Microsoft.CSharp/tests/ILLink.Descriptors.xml b/src/libraries/Microsoft.CSharp/tests/ILLink.Descriptors.xml
diff --git a/src/libraries/Microsoft.CSharp/tests/Microsoft.CSharp.Tests.csproj b/src/libraries/Microsoft.CSharp/tests/Microsoft.CSharp.Tests.csproj
@@ -11,7 +11,6 @@
     <DebuggerSupport Condition="'$(DebuggerSupport)' == '' and ('$(TargetOS)' == 'browser' or '$(TargetOS)' == 'wasi')">true</DebuggerSupport>
   </PropertyGroup>
   <ItemGroup>
-    <TrimmerRootDescriptor Include="$(MSBuildThisFileDirectory)ILLink.Descriptors.xml" />
     <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\IsExternalInit.cs" Link="Common\System\Runtime\CompilerServices\IsExternalInit.cs" />
     <Compile Include="AccessTests.cs" />
     <Compile Include="ArrayHandling.cs" />

Original file line number	Diff line number	Diff line change
`@@ -83,7 +83,7 @@ public void AddAssignment(dynamic lhs, dynamic rhs, object expected)`
`83`	`83`	`{`
`84`	`84`	`lhs += rhs;`
`85`	`85`	`Assert.Equal(expected, lhs);`
`86`		`- Assert.IsType(expected.GetType(), lhs);`
	`86`	`+ Assert.IsType(expected.GetType(), (object)lhs);`
`87`	`87`	`}`
`88`	`88`
`89`	`89`	`[Theory, MemberData(nameof(PropertyAdditions))]`