System.Collections.Immutable by Microsoft

<PackageReference Include="System.Collections.Immutable" Version="10.0.0-preview.2.25163.2" />

.NET API 251,152 bytes

DoesNotReturnIfAttribute

sealed class DoesNotReturnIfAttribute : Attribute

public bool ParameterValue { get; }

public DoesNotReturnIfAttribute(bool parameterValue)