namespace NUnit.Framework.Constraints { public sealed class ConstraintBuilder : IResolveConstraint { public sealed class ConstraintStack { public bool Empty { get; } public ConstraintStack(ConstraintBuilder builder); public void Push(IConstraint constraint); public IConstraint Pop(); } public ConstraintBuilder(); public void Append(ConstraintOperator op); public void Append(Constraint constraint); public void Replace(Constraint constraint); public IConstraint Resolve(); } }