XiuXianGame/Assets/Packages/System.Collections.Immutable.6.0.0/buildTransitive/netcoreapp2.0/System.Collections.Immutable.targets

<Project InitialTargets="NETStandardCompatError_System_Collections_Immutable_netcoreapp3_1">
  <Target Name="NETStandardCompatError_System_Collections_Immutable_netcoreapp3_1"
          Condition="'$(SuppressTfmSupportBuildWarnings)' == ''">
    <Error Text="System.Collections.Immutable doesn't support $(TargetFramework). Consider updating your TargetFramework to netcoreapp3.1 or later." />
  </Target>
</Project>