コード例 #1
0
            public override ResolvedSignature OnSignature(ResolvedSignature s)
            {
                if (s.TypeParameters.Any())
                {
                    throw new Exception("Signatures cannot contains type parameters");
                }

                return(base.OnSignature(s));
            }
コード例 #2
0
 public override ResolvedSignature OnSignature(ResolvedSignature s)
 {
     // Remove the type parameters from the signature
     s = new ResolvedSignature(
         ImmutableArray <QsLocalSymbol> .Empty,
         s.ArgumentType,
         s.ReturnType,
         s.Information);
     return(base.OnSignature(s));
 }
コード例 #3
0
        public void ExcludeInaccessible()
        {
            var elements = new[] { Access.Public, Access.Internal }
            .SelectMany(access =>
            {
                var source = new Source("Tests.qs", QsNullable <string> .Null);
                var unit   = ResolvedType.New(QsType.UnitType);

                var signature = new ResolvedSignature(
                    Array.Empty <QsLocalSymbol>().ToImmutableArray(),
                    unit,
                    unit,
                    CallableInformation.NoInformation);
                var argumentTuple = QsTuple <ArgDeclType> .NewQsTuple(ImmutableArray.Create <QsTuple <ArgDeclType> >());
                var callable      = new QsCallable(
                    kind: QsCallableKind.Operation,
                    fullName: MakeFullName(access + "Operation"),
                    attributes: ImmutableArray <QsDeclarationAttribute> .Empty,
                    access,
                    source: source,
                    location: ZeroLocation,
                    signature: signature,
                    argumentTuple: argumentTuple,
                    specializations: ImmutableArray.Create <QsSpecialization>(),
                    documentation: ImmutableArray.Create <string>(),
                    comments: QsComments.Empty);

                var typeItems = QsTuple <QsTypeItem> .NewQsTuple(
                    ImmutableArray.Create(QsTuple <QsTypeItem> .NewQsTupleItem(QsTypeItem.NewAnonymous(unit))));
                var type = new QsCustomType(
                    fullName: MakeFullName(access + "Type"),
                    attributes: ImmutableArray <QsDeclarationAttribute> .Empty,
                    access,
                    source: source,
                    location: ZeroLocation,
                    type: unit,
                    typeItems: typeItems,
                    documentation: ImmutableArray.Create <string>(),
                    comments: QsComments.Empty);
                return(new[]
                {
                    QsNamespaceElement.NewQsCallable(callable),
                    QsNamespaceElement.NewQsCustomType(type)
                });
            });
            var emptyLookup = Array.Empty <ImmutableArray <string> >().ToLookup(x => "");
            var ns          = new QsNamespace(CanonName, elements.ToImmutableArray(), emptyLookup);
            var docNs       = new DocNamespace(ns);
            var stream      = new MemoryStream();

#pragma warning disable 618 // WriteToStream is obsolete.
            docNs.WriteToStream(stream, null);
#pragma warning restore 618

            var expected = @"### YamlMime:QSharpNamespace
# This file is automatically generated.
# Please do not modify this file manually, or your changes may be lost when
# documentation is rebuilt.

uid: microsoft.quantum.canon
name: Microsoft.Quantum.Canon
operations:
- uid: microsoft.quantum.canon.publicoperation
  summary: ''
newtypes:
- uid: microsoft.quantum.canon.publictype
  summary: ''
...
";
            var actual   = Encoding.UTF8.GetString(stream.ToArray());
            Assert.Equal(expected, actual);
        }
コード例 #4
0
            private (ResolvedSignature, IEnumerable <QsSpecialization>) MakeSpecializations(
                QsQualifiedName callableName, ResolvedType paramsType, SpecializationImplementation bodyImplementation)
            {
                QsSpecialization MakeSpec(QsSpecializationKind kind, ResolvedSignature signature, SpecializationImplementation impl) =>
                new QsSpecialization(
                    kind,
                    callableName,
                    ImmutableArray <QsDeclarationAttribute> .Empty,
                    this.CurrentCallable.Callable.SourceFile,
                    QsNullable <QsLocation> .Null,
                    QsNullable <ImmutableArray <ResolvedType> > .Null,
                    signature,
                    impl,
                    ImmutableArray <string> .Empty,
                    QsComments.Empty);

                var adj    = this.CurrentCallable.Adjoint;
                var ctl    = this.CurrentCallable.Controlled;
                var ctlAdj = this.CurrentCallable.ControlledAdjoint;

                bool addAdjoint    = false;
                bool addControlled = false;
                bool isSelfAdjoint = false;

                if (this.InWithinBlock)
                {
                    addAdjoint    = true;
                    addControlled = false;
                }
                else if (this.InBody)
                {
                    if (adj != null && adj.Implementation is SpecializationImplementation.Generated adjGen)
                    {
                        addAdjoint    = adjGen.Item.IsInvert;
                        isSelfAdjoint = adjGen.Item.IsSelfInverse;
                    }
                    if (ctl != null && ctl.Implementation is SpecializationImplementation.Generated ctlGen)
                    {
                        addControlled = ctlGen.Item.IsDistribute;
                    }
                    if (ctlAdj != null && ctlAdj.Implementation is SpecializationImplementation.Generated ctlAdjGen)
                    {
                        addAdjoint    = addAdjoint || (ctlAdjGen.Item.IsInvert && ctl.Implementation.IsGenerated);
                        addControlled = addControlled || (ctlAdjGen.Item.IsDistribute && adj.Implementation.IsGenerated);
                        isSelfAdjoint = isSelfAdjoint || ctlAdjGen.Item.IsSelfInverse;
                    }
                }
                else if (ctlAdj != null && ctlAdj.Implementation is SpecializationImplementation.Generated gen)
                {
                    addControlled = this.InAdjoint && gen.Item.IsDistribute;
                    addAdjoint    = this.InControlled && gen.Item.IsInvert;
                    isSelfAdjoint = gen.Item.IsSelfInverse;
                }

                var props = new List <OpProperty>();

                if (addAdjoint)
                {
                    props.Add(OpProperty.Adjointable);
                }
                if (addControlled)
                {
                    props.Add(OpProperty.Controllable);
                }
                var newSig = new ResolvedSignature(
                    this.CurrentCallable.Callable.Signature.TypeParameters,
                    paramsType,
                    ResolvedType.New(ResolvedTypeKind.UnitType),
                    new CallableInformation(ResolvedCharacteristics.FromProperties(props), new InferredCallableInformation(isSelfAdjoint, false)));

                var controlledSig = new ResolvedSignature(
                    newSig.TypeParameters,
                    ResolvedType.New(ResolvedTypeKind.NewTupleType(ImmutableArray.Create(
                                                                       ResolvedType.New(ResolvedTypeKind.NewArrayType(ResolvedType.New(ResolvedTypeKind.Qubit))),
                                                                       newSig.ArgumentType))),
                    newSig.ReturnType,
                    newSig.Information);

                var specializations = new List <QsSpecialization>()
                {
                    MakeSpec(QsSpecializationKind.QsBody, newSig, bodyImplementation)
                };

                if (addAdjoint)
                {
                    specializations.Add(MakeSpec(
                                            QsSpecializationKind.QsAdjoint,
                                            newSig,
                                            SpecializationImplementation.NewGenerated(QsGeneratorDirective.Invert)));
                }

                if (addControlled)
                {
                    specializations.Add(MakeSpec(
                                            QsSpecializationKind.QsControlled,
                                            controlledSig,
                                            SpecializationImplementation.NewGenerated(QsGeneratorDirective.Distribute)));
                }

                if (addAdjoint && addControlled)
                {
                    specializations.Add(MakeSpec(
                                            QsSpecializationKind.QsControlledAdjoint,
                                            controlledSig,
                                            SpecializationImplementation.NewGenerated(QsGeneratorDirective.Distribute)));
                }

                return(newSig, specializations);
            }
コード例 #5
0
        public void ParseOp()
        {
            ArgDeclType BuildArgument(string name, ResolvedType t)
            {
                var validName = QsLocalSymbol.NewValidName(NonNullable <string> .New(name));
                var info      = new InferredExpressionInformation(false, false);

                return(new ArgDeclType(validName, t, info, QsNullable <Tuple <int, int> > .Null, EmptyRange));
            }

            string[] comments =
            {
                "# Summary",
                "Convenience function that performs state preparation by applying a ",
                "`statePrepUnitary` on the input state, followed by adiabatic state ",
                "preparation using a `adiabaticUnitary`, and finally phase estimation ",
                "with respect to `qpeUnitary`on the resulting state using a ",
                "`phaseEstAlgorithm`.",
                "",
                "# Input",
                "## statePrepUnitary",
                "An oracle representing state preparation for the initial dynamical",
                "generator.",
                "## adiabaticUnitary",
                "An oracle representing the adiabatic evolution algorithm to be used",
                "to implement the sweeps to the final state of the algorithm.",
                "## qpeUnitary",
                "An oracle representing a unitary operator $U$ representing evolution",
                "for time $\\delta t$ under a dynamical generator with ground state",
                "$\\ket{\\phi}$ and ground state energy $E = \\phi\\\\,\\delta t$.",
                "## phaseEstAlgorithm",
                "An operation that performs phase estimation on a given unitary operation.",
                "See [iterative phase estimation](/quantum/libraries/characterization#iterative-phase-estimation)",
                "for more details.",
                "## qubits",
                "A register of qubits to be used to perform the simulation.",
                "",
                "# Output",
                "An estimate $\\hat{\\phi}$ of the ground state energy $\\phi$",
                "of the generator represented by $U$."
            };
            string expected = @"### YamlMime:QSharpType
uid: microsoft.quantum.canon.adiabaticstateenergyunitary
name: AdiabaticStateEnergyUnitary
type: operation
namespace: Microsoft.Quantum.Canon
summary: |-
  Convenience function that performs state preparation by applying a
  `statePrepUnitary` on the input state, followed by adiabatic state
  preparation using a `adiabaticUnitary`, and finally phase estimation
  with respect to `qpeUnitary`on the resulting state using a
  `phaseEstAlgorithm`.
syntax: 'operation AdiabaticStateEnergyUnitary (statePrepUnitary : (Qubit[] => Unit), adiabaticUnitary : (Qubit[] => Unit), qpeUnitary : (Qubit[] => Unit is Adj + Ctl), phaseEstAlgorithm : ((Microsoft.Quantum.Canon.DiscreteOracle, Qubit[]) => Double), qubits : Qubit[]) : Double'
input:
  content: '(statePrepUnitary : (Qubit[] => Unit), adiabaticUnitary : (Qubit[] => Unit), qpeUnitary : (Qubit[] => Unit is Adj + Ctl), phaseEstAlgorithm : ((Microsoft.Quantum.Canon.DiscreteOracle, Qubit[]) => Double), qubits : Qubit[])'
  types:
  - name: statePrepUnitary
    summary: |-
      An oracle representing state preparation for the initial dynamical
      generator.
    isOperation: true
    input:
      types:
      - isArray: true
        isPrimitive: true
        uid: Qubit
    output:
      types:
      - isPrimitive: true
        uid: Unit
  - name: adiabaticUnitary
    summary: |-
      An oracle representing the adiabatic evolution algorithm to be used
      to implement the sweeps to the final state of the algorithm.
    isOperation: true
    input:
      types:
      - isArray: true
        isPrimitive: true
        uid: Qubit
    output:
      types:
      - isPrimitive: true
        uid: Unit
  - name: qpeUnitary
    summary: |-
      An oracle representing a unitary operator $U$ representing evolution
      for time $\delta t$ under a dynamical generator with ground state
      $\ket{\phi}$ and ground state energy $E = \phi\\,\delta t$.
    isOperation: true
    input:
      types:
      - isArray: true
        isPrimitive: true
        uid: Qubit
    output:
      types:
      - isPrimitive: true
        uid: Unit
    functors:
    - Adjoint
    - Controlled
  - name: phaseEstAlgorithm
    summary: |-
      An operation that performs phase estimation on a given unitary operation.
      See [iterative phase estimation](/quantum/libraries/characterization#iterative-phase-estimation)
      for more details.
    isOperation: true
    input:
      types:
      - uid: microsoft.quantum.canon.discreteoracle
      - isArray: true
        isPrimitive: true
        uid: Qubit
    output:
      types:
      - isPrimitive: true
        uid: Double
  - name: qubits
    summary: A register of qubits to be used to perform the simulation.
    isArray: true
    isPrimitive: true
    uid: Qubit
output:
  content: Double
  types:
  - summary: |-
      An estimate $\hat{\phi}$ of the ground state energy $\phi$
      of the generator represented by $U$.
    isPrimitive: true
    uid: Double
...
";

            var qubitArrayType = ResolvedType.New(QsType.NewArrayType(ResolvedType.New(QsType.Qubit)));
            var unitType       = ResolvedType.New(QsType.UnitType);
            var doubleType     = ResolvedType.New(QsType.Double);
            var oracleType     = ResolvedType.New(QsType.NewUserDefinedType(new UserDefinedType(CanonName,
                                                                                                NonNullable <string> .New("DiscreteOracle"),
                                                                                                QsNullable <Tuple <QsPositionInfo, QsPositionInfo> > .Null)));
            var noInfo = CallableInformation.NoInformation;
            var acFunctors = ResolvedCharacteristics.FromProperties(new[] { OpProperty.Adjointable, OpProperty.Controllable });
            var acInfo = new CallableInformation(acFunctors, InferredCallableInformation.NoInformation);
            var qubitToUnitOp = ResolvedType.New(QsType.NewOperation(new SigTypeTuple(qubitArrayType, unitType), noInfo));
            var qubitToUnitOpAC = ResolvedType.New(QsType.NewOperation(new SigTypeTuple(qubitArrayType, unitType), acInfo));
            var phaseEstArgs = new ResolvedType[] { oracleType, qubitArrayType }.ToImmutableArray();
            var phaseEstArgTuple = ResolvedType.New(QsType.NewTupleType(phaseEstArgs));
            var phaseEstOp       = ResolvedType.New(QsType.NewOperation(new SigTypeTuple(phaseEstArgTuple, doubleType), noInfo));

            var typeParams = new QsLocalSymbol[] { }.ToImmutableArray();
            var argTypes = new ResolvedType[] { qubitToUnitOp, qubitToUnitOp, qubitToUnitOpAC, phaseEstOp, qubitArrayType }.ToImmutableArray();
            var argTupleType = ResolvedType.New(QsType.NewTupleType(argTypes));
            var signature    = new ResolvedSignature(typeParams, argTupleType, doubleType, noInfo);

            var args = new List <ArgDeclType> {
                BuildArgument("statePrepUnitary", qubitToUnitOp),
                BuildArgument("adiabaticUnitary", qubitToUnitOp),
                BuildArgument("qpeUnitary", qubitToUnitOpAC),
                BuildArgument("phaseEstAlgorithm", phaseEstOp),
                BuildArgument("qubits", qubitArrayType)
            }
            .ConvertAll(arg => QsTuple <ArgDeclType> .NewQsTupleItem(arg))
            .ToImmutableArray();
            var argTuple = QsTuple <ArgDeclType> .NewQsTuple(args);

            var specs = new QsSpecialization[] { }.ToImmutableArray();

            var qsCallable = new QsCallable(QsCallableKind.Operation,
                                            MakeFullName("AdiabaticStateEnergyUnitary"),
                                            ImmutableArray <QsDeclarationAttribute> .Empty,
                                            NonNullable <string> .New("Techniques.qs"),
                                            ZeroLocation,
                                            signature,
                                            argTuple,
                                            specs,
                                            comments.ToImmutableArray(),
                                            QsComments.Empty);
            var callable = new DocCallable("Microsoft.Quantum.Canon", qsCallable);

            var stream = new StringWriter();

            callable.WriteToFile(stream);
            var s = stream.ToString();

            Assert.Equal(expected, s);
        }
コード例 #6
0
        /// <summary>
        /// Creates a separate callable for each intrinsic specialization,
        /// and replaces the specialization implementations of the original callable with a call to these.
        /// Self adjoint generation directives in intrinsic callables are replaced by a provided implementation.
        /// Type constructors and generic callables or callables that already define a target instruction name are left unchanged.
        /// </summary>
        /// <exception cref="ArgumentException">
        /// An intrinsic callable contains non-intrinsic specializations
        /// or a non-intrinsic callable contains intrinsic specializations,
        /// or the a callable doesn't have a body specialization.
        /// </exception>
        /// <exception cref="InvalidOperationException">
        /// A specialization has explicit type arguments;
        /// Monomorphization needs to run before separating target instructions.
        /// </exception>
        private static QsNamespace LiftIntrinsicSpecializations(QsNamespace ns)
        {
            var elements = ImmutableArray.CreateBuilder <QsNamespaceElement>();

            foreach (var element in ns.Elements)
            {
                if (element is QsNamespaceElement.QsCallable c &&
                    c.Item.Signature.TypeParameters.Length == 0 &&
                    !c.Item.Kind.IsTypeConstructor)
                {
                    if (c.Item.IsIntrinsic)
                    {
                        QsCallable callable = c.Item;
                        if (!callable.Specializations.Any(spec => spec.Kind.IsQsBody))
                        {
                            throw new ArgumentException("missing body specialization");
                        }
                        else if (callable.Specializations.Any(spec => spec.TypeArguments.IsValue))
                        {
                            throw new InvalidOperationException("specialization with type arguments");
                        }
                        else if (callable.Specializations.Length == 1 && callable.Attributes.Any(BuiltIn.DefinesTargetInstruction))
                        {
                            elements.Add(element);
                        }
                        else
                        {
                            QsQualifiedName GeneratedName(QsSpecializationKind kind) =>
                            new QsQualifiedName(callable.FullName.Namespace, $"{callable.FullName.Name}{SpecializationSuffix(kind)}");

                            var specializations = ImmutableArray.CreateRange(callable.Specializations.Select(spec =>
                            {
                                var inferredInfo = spec.Signature.Information.InferredInformation;
                                if (!inferredInfo.IsIntrinsic && !inferredInfo.IsSelfAdjoint)
                                {
                                    throw new ArgumentException("non-intrinsic specialization for intrinsic callable");
                                }

                                // Get the correct argument tuple both for the added intrinsic callable
                                // and the generated provided specialization that replaces the intrinsic one.
                                var argTuple = BuildSpecArgTuple(callable.ArgumentTuple, spec.Kind);

                                // Create a separate callable for that specialization,
                                // unless the specialization is not needed for a self-adjoint callable.

                                var genCallableSignature = new ResolvedSignature(
                                    ImmutableArray <QsLocalSymbol> .Empty,
                                    spec.Signature.ArgumentType,
                                    spec.Signature.ReturnType,
                                    new CallableInformation(
                                        ResolvedCharacteristics.Empty,
                                        new InferredCallableInformation(isIntrinsic: true, isSelfAdjoint: false)));
                                var genCallableName = GeneratedName(
                                    inferredInfo.IsSelfAdjoint && spec.Kind.IsQsAdjoint ? QsSpecializationKind.QsBody :
                                    inferredInfo.IsSelfAdjoint && spec.Kind.IsQsControlledAdjoint ? QsSpecializationKind.QsControlled :
                                    spec.Kind);

                                if (!inferredInfo.IsSelfAdjoint || spec.Kind.IsQsBody || spec.Kind.IsQsControlled)
                                {
                                    var genCallableBody = new QsSpecialization(
                                        QsSpecializationKind.QsBody,
                                        genCallableName,
                                        spec.Attributes,
                                        spec.Source,
                                        QsNullable <QsLocation> .Null,
                                        spec.TypeArguments,
                                        genCallableSignature,
                                        SpecializationImplementation.Intrinsic,
                                        spec.Documentation,
                                        spec.Comments);
                                    var genCallable = new QsCallable(
                                        callable.Kind,
                                        genCallableName,
                                        callable.Attributes,
                                        callable.Access,
                                        spec.Source,
                                        spec.Location,
                                        genCallableSignature,
                                        argTuple,
                                        ImmutableArray.Create(genCallableBody),
                                        ImmutableArray <string> .Empty,
                                        QsComments.Empty);
                                    elements.Add(QsNamespaceElement.NewQsCallable(genCallable));
                                }

                                // Create a specialization that calls into the generated callable,
                                // or the corresponding callable no callable for the specialization
                                // has been added due to hte operation being self-adjoint.

                                var genCallableType =
                                    callable.Kind == QsCallableKind.Operation
                                    ? OperationTypeFromSignature(genCallableSignature)
                                    : TypeKind.NewFunction(genCallableSignature.ArgumentType, genCallableSignature.ReturnType);
                                var call = SyntaxGenerator.CallNonGeneric(
                                    IdentifierForCallable(genCallableName, genCallableType),
                                    SyntaxGenerator.ArgumentTupleAsExpression(argTuple));
                                var statement = new QsStatement(
                                    QsStatementKind.NewQsReturnStatement(call),
                                    LocalDeclarations.Empty,
                                    QsNullable <QsLocation> .Null,
                                    QsComments.Empty);
                                var localDeclarations = new LocalDeclarations(
                                    SyntaxGenerator.ValidDeclarations(SyntaxGenerator.ExtractItems(argTuple)));

                                return(spec.WithImplementation(SpecializationImplementation.NewProvided(
                                                                   argTuple,
                                                                   new QsScope(ImmutableArray.Create(statement), localDeclarations))));
                            }));

                            // Create a callable that contains all specializations that
                            // call into the generated callables for each specialization.

                            var inlineAttribute = AttributeUtils.BuildAttribute(BuiltIn.Inline.FullName, SyntaxGenerator.UnitValue);
                            var signature       = new ResolvedSignature(
                                ImmutableArray <QsLocalSymbol> .Empty,
                                callable.Signature.ArgumentType,
                                callable.Signature.ReturnType,
                                new CallableInformation(
                                    callable.Signature.Information.Characteristics,
                                    new InferredCallableInformation(isSelfAdjoint: callable.IsSelfAdjoint, isIntrinsic: false)));
                            var redirect = new QsCallable(
                                callable.Kind,
                                callable.FullName,
                                ImmutableArray.Create(inlineAttribute),
                                callable.Access,
                                callable.Source,
                                callable.Location,
                                signature,
                                callable.ArgumentTuple,
                                specializations,
                                callable.Documentation,
                                callable.Comments);
                            elements.Add(QsNamespaceElement.NewQsCallable(redirect));
                        }
                    }
                    else if (c.Item.Specializations.Any(spec => spec.Implementation.IsIntrinsic))
                    {
                        throw new ArgumentException("intrinsic specialization for non-intrinsic callable");
                    }
                    else
                    {
                        elements.Add(element);
                    }
                }
コード例 #7
0
 private static TypeKind OperationTypeFromSignature(ResolvedSignature signature) =>
 TypeKind.NewOperation(
     Tuple.Create(signature.ArgumentType, signature.ReturnType),
     signature.Information);
コード例 #8
0
        public void ExcludeInaccessible()
        {
            var elements =
                new[] { AccessModifier.DefaultAccess, AccessModifier.Internal }
            .SelectMany(access =>
            {
                var source = NonNullable <string> .New("Tests.qs");
                var unit   = ResolvedType.New(QsType.UnitType);

                var signature = new ResolvedSignature(Array.Empty <QsLocalSymbol>().ToImmutableArray(),
                                                      unit,
                                                      unit,
                                                      CallableInformation.NoInformation);
                var argumentTuple = QsTuple <ArgDeclType> .NewQsTuple(ImmutableArray.Create <QsTuple <ArgDeclType> >());
                var callable      = new QsCallable(kind: QsCallableKind.Operation,
                                                   fullName: MakeFullName(access + "Operation"),
                                                   attributes: ImmutableArray <QsDeclarationAttribute> .Empty,
                                                   modifiers: new Modifiers(access),
                                                   sourceFile: source,
                                                   location: ZeroLocation,
                                                   signature: signature,
                                                   argumentTuple: argumentTuple,
                                                   specializations: ImmutableArray.Create <QsSpecialization>(),
                                                   documentation: ImmutableArray.Create <string>(),
                                                   comments: QsComments.Empty);

                var typeItems = QsTuple <QsTypeItem> .NewQsTuple(
                    ImmutableArray.Create(QsTuple <QsTypeItem> .NewQsTupleItem(QsTypeItem.NewAnonymous(unit))));
                var type = new QsCustomType(fullName: MakeFullName(access + "Type"),
                                            attributes: ImmutableArray <QsDeclarationAttribute> .Empty,
                                            modifiers: new Modifiers(access),
                                            sourceFile: source,
                                            location: ZeroLocation,
                                            type: unit,
                                            typeItems: typeItems,
                                            documentation: ImmutableArray.Create <string>(),
                                            comments: QsComments.Empty);
                return(new[]
                {
                    QsNamespaceElement.NewQsCallable(callable),
                    QsNamespaceElement.NewQsCustomType(type)
                });
            });
            var emptyLookup = Array.Empty <ImmutableArray <string> >().ToLookup(x => NonNullable <string> .New(""));
            var ns          = new QsNamespace(CanonName, elements.ToImmutableArray(), emptyLookup);
            var docNs       = new DocNamespace(ns);
            var stream      = new MemoryStream();

            docNs.WriteToStream(stream, null);

            var expected = @"### YamlMime:QSharpNamespace
uid: microsoft.quantum.canon
name: Microsoft.Quantum.Canon
operations:
- uid: microsoft.quantum.canon.defaultaccessoperation
  summary: ''
newtypes:
- uid: microsoft.quantum.canon.defaultaccesstype
  summary: ''
...
";
            var actual   = Encoding.UTF8.GetString(stream.ToArray());

            Assert.Equal(expected, actual);
        }