Examples with Type org.eclipse.n4js.ts.types.Type used on opensource projects

Example 66 with Type

use of org.eclipse.n4js.ts.types.Type in project n4js by eclipse.

the class N4JSSyntaxValidator method checkInterfaceDeclaration.

/**
 * Checks that no "with" or "role" is used and that list of implemented interfaces is separated with commas and not
 * with keywords. These checks (with some warnings created instead of errors) should help the transition from roles
 * to interfaces. However, they may be useful later on as well, e.g., if an interface is manually refactored into a
 * class or vice versa.
 * <p>
 * Note that "with" is used in Dart for roles, so maybe it is useful to have a user-friendly message instead of a
 * parser error.
 * <p>
 * "role" will be removed in grammar.
 */
@Check
public void checkInterfaceDeclaration(N4InterfaceDeclaration n4InterfaceDecl) {
    ICompositeNode node = NodeModelUtils.findActualNodeFor(n4InterfaceDecl);
    ILeafNode keywordNode;
    keywordNode = findLeafWithKeyword(n4InterfaceDecl, "{", node, IMPLEMENTS_KEYWORD, false);
    if (keywordNode != null) {
        TInterface tinterface = n4InterfaceDecl.getDefinedTypeAsInterface();
        if (tinterface == null) {
            // avoid consequential errors
            return;
        }
        if (tinterface.getSuperInterfaceRefs().isEmpty()) {
            // ok
            return;
        }
        if (tinterface.getSuperInterfaceRefs().stream().allMatch(superTypeRef -> superTypeRef.getDeclaredType() instanceof TInterface)) {
            List<? extends IdentifiableElement> interfaces = tinterface.getSuperInterfaceRefs().stream().flatMap((ParameterizedTypeRef ref) -> {
                Type declaredType = ref.getDeclaredType();
                if (declaredType instanceof TInterface) {
                    return Stream.of((TInterface) declaredType);
                }
                return Stream.empty();
            }).collect(Collectors.toList());
            String message = getMessageForSYN_KW_EXTENDS_IMPLEMENTS_MIXED_UP(validatorMessageHelper.description(tinterface), "implement", "interface" + (interfaces.size() > 1 ? "s " : " ") + validatorMessageHelper.names(interfaces), EXTENDS_KEYWORD);
            addIssue(message, n4InterfaceDecl, keywordNode.getTotalOffset(), keywordNode.getLength(), SYN_KW_EXTENDS_IMPLEMENTS_MIXED_UP);
        }
    }
}

Example 67 with Type

use of org.eclipse.n4js.ts.types.Type in project n4js by eclipse.

the class InternalTypeSystem method applyRuleExpectedTypeOfArgument.

protected Result<TypeRef> applyRuleExpectedTypeOfArgument(final RuleEnvironment G, final RuleApplicationTrace _trace_, final Argument argument, final Expression argumentExpression) throws RuleFailedException {
    // output parameter
    TypeRef T = null;
    final EObject expr = argument.eContainer();
    if ((expr instanceof NewExpression)) {
        boolean _contains = ((NewExpression) expr).getArguments().contains(argument);
        boolean _not = (!_contains);
        if (_not) {
        } else {
            /* G |- expr.callee : var TypeTypeRef ctorTypeRef */
            Expression _callee = ((NewExpression) expr).getCallee();
            TypeTypeRef ctorTypeRef = null;
            Result<TypeRef> result = typeInternal(G, _trace_, _callee);
            checkAssignableTo(result.getFirst(), TypeTypeRef.class);
            ctorTypeRef = (TypeTypeRef) result.getFirst();
            TypeRef typeRefOfInstanceToCreate = this.typeSystemHelper.createTypeRefFromStaticType(G, ctorTypeRef, ((TypeArgument[]) Conversions.unwrapArray(((NewExpression) expr).getTypeArgs(), TypeArgument.class)));
            Type _declaredType = typeRefOfInstanceToCreate.getDeclaredType();
            ContainerType<?> typeOfInstanceToCreate = ((ContainerType<?>) _declaredType);
            final RuleEnvironment G2 = RuleEnvironmentExtensions.wrap(G);
            this.typeSystemHelper.addSubstitutions(G2, typeRefOfInstanceToCreate);
            RuleEnvironmentExtensions.addThisType(G2, typeRefOfInstanceToCreate);
            TMethod ctor = this.containerTypesHelper.fromContext(((NewExpression) expr).eResource()).findConstructor(typeOfInstanceToCreate);
            TFormalParameter _fparForArgIdx = null;
            if (ctor != null) {
                _fparForArgIdx = ctor.getFparForArgIdx(ECollections.indexOf(((NewExpression) expr).getArguments(), argument, 0));
            }
            final TFormalParameter fpar = _fparForArgIdx;
            if ((fpar == null)) {
                T = TypeRefsFactory.eINSTANCE.createUnknownTypeRef();
            } else {
                final TypeRef paramType = fpar.getTypeRef();
                if ((paramType == null)) {
                    T = RuleEnvironmentExtensions.anyTypeRef(G2);
                } else {
                    /* G2 |- paramType ~> T */
                    Result<TypeArgument> result_1 = substTypeVariablesInternal(G2, _trace_, paramType);
                    checkAssignableTo(result_1.getFirst(), TypeRef.class);
                    T = (TypeRef) result_1.getFirst();
                }
            }
        }
    } else {
        if ((expr instanceof ParameterizedCallExpression)) {
            boolean _contains_1 = ((ParameterizedCallExpression) expr).getArguments().contains(argument);
            /* expr.arguments.contains(argument) */
            if (!_contains_1) {
                sneakyThrowRuleFailedException("expr.arguments.contains(argument)");
            }
            /* G |- expr.target : var TypeRef targetTypeRef */
            Expression _target = ((ParameterizedCallExpression) expr).getTarget();
            TypeRef targetTypeRef = null;
            Result<TypeRef> result_2 = typeInternal(G, _trace_, _target);
            checkAssignableTo(result_2.getFirst(), TypeRef.class);
            targetTypeRef = (TypeRef) result_2.getFirst();
            if ((targetTypeRef instanceof FunctionTypeExprOrRef)) {
                final FunctionTypeExprOrRef F = ((FunctionTypeExprOrRef) targetTypeRef);
                final int argIndex = ECollections.indexOf(((ParameterizedCallExpression) expr).getArguments(), argument, 0);
                final TFormalParameter fpar_1 = F.getFparForArgIdx(argIndex);
                if ((fpar_1 == null)) {
                    T = TypeRefsFactory.eINSTANCE.createUnknownTypeRef();
                } else {
                    final TypeRef paramType_1 = fpar_1.getTypeRef();
                    if ((paramType_1 == null)) {
                        T = RuleEnvironmentExtensions.anyTypeRef(G);
                    } else {
                        final RuleEnvironment G2_1 = RuleEnvironmentExtensions.wrap(G);
                        this.typeSystemHelper.addSubstitutions(G2_1, ((ParameterizedCallExpression) expr), F);
                        Expression _target_1 = ((ParameterizedCallExpression) expr).getTarget();
                        if ((_target_1 instanceof SuperLiteral)) {
                            N4ClassDeclaration _containerOfType = EcoreUtil2.<N4ClassDeclaration>getContainerOfType(expr, N4ClassDeclaration.class);
                            Type _definedType = null;
                            if (_containerOfType != null) {
                                _definedType = _containerOfType.getDefinedType();
                            }
                            final Type containingClass = _definedType;
                            if ((containingClass instanceof TClass)) {
                                RuleEnvironmentExtensions.addThisType(G2_1, TypeExtensions.ref(containingClass));
                                ParameterizedTypeRef _superClassRef = ((TClass) containingClass).getSuperClassRef();
                                boolean _tripleNotEquals = (_superClassRef != null);
                                if (_tripleNotEquals) {
                                    this.typeSystemHelper.addSubstitutions(G2_1, ((TClass) containingClass).getSuperClassRef());
                                }
                                if ((paramType_1 instanceof ThisTypeRefStructural)) {
                                    RuleEnvironmentExtensions.addThisType(G2_1, ((TClass) containingClass).getSuperClassRef());
                                }
                            }
                        }
                        /* G2 |- paramType ~> T */
                        Result<TypeArgument> result_3 = substTypeVariablesInternal(G2_1, _trace_, paramType_1);
                        checkAssignableTo(result_3.getFirst(), TypeRef.class);
                        T = (TypeRef) result_3.getFirst();
                    }
                }
            } else {
                T = TypeRefsFactory.eINSTANCE.createUnknownTypeRef();
            }
        }
    }
    return new Result<TypeRef>(T);
}

Example 68 with Type

use of org.eclipse.n4js.ts.types.Type in project n4js by eclipse.

the class InternalTypeSystem method applyRuleTypeIndexedAccessExpression.

protected Result<TypeRef> applyRuleTypeIndexedAccessExpression(final RuleEnvironment G, final RuleApplicationTrace _trace_, final IndexedAccessExpression expr) throws RuleFailedException {
    // output parameter
    TypeRef T = null;
    /* { expr.target === null || expr.index === null; T = TypeRefsFactory.eINSTANCE.createUnknownTypeRef } or { expr.target instanceof SuperLiteral T = TypeRefsFactory.eINSTANCE.createUnknownTypeRef } or { G |- expr.target : var TypeRef targetTypeRef targetTypeRef = typeSystemHelper.resolveType(G, targetTypeRef); G |- expr.index : var TypeRef indexTypeRef; val targetDeclType = targetTypeRef.declaredType; val targetIsLiteralOfStringBasedEnum = targetDeclType instanceof TEnum && AnnotationDefinition.STRING_BASED.hasAnnotation(targetDeclType); val indexIsNumeric = { G |- indexTypeRef <: G.numberTypeRef }; val indexValue = ASTMetaInfoUtils.getCompileTimeValue(expr.index); val memberName = N4JSLanguageUtils.derivePropertyNameFromCompileTimeValue(indexValue); if (indexIsNumeric && (targetTypeRef.isArrayLike || targetIsLiteralOfStringBasedEnum)) { if (targetDeclType.generic && targetTypeRef.typeArgs.isEmpty) { T = G.anyTypeRef } else { val G2 = G.wrap typeSystemHelper.addSubstitutions(G2, targetTypeRef) G2.addThisType(targetTypeRef) val elementTypeRef = if(targetIsLiteralOfStringBasedEnum) { G.stringType.elementType } else { targetDeclType.elementType }; G2 |- elementTypeRef ~> T } } else if (memberName!==null) { val staticAccess = (targetTypeRef instanceof TypeTypeRef) val checkVisibility = false val scope = memberScopingHelper.createMemberScope(targetTypeRef, expr, checkVisibility, staticAccess) val memberDesc = if(memberName!==null && !memberName.isEmpty()) { scope.getSingleElement(qualifiedNameConverter.toQualifiedName(memberName)) }; val member = if(memberDesc!==null && !IEObjectDescriptionWithError.isErrorDescription(memberDesc)) { memberDesc.getEObjectOrProxy() }; if(member instanceof TMember && !member.eIsProxy) { G |- (member as TMember) : var TypeRef memberTypeRef val G2 = G.wrap typeSystemHelper.addSubstitutions(G2,targetTypeRef) G2.addThisType(targetTypeRef) G2 |- memberTypeRef ~> T } else if (targetTypeRef.dynamic) { T = G.anyTypeRefDynamic } else { T = TypeRefsFactory.eINSTANCE.createUnknownTypeRef } } else if (targetTypeRef.dynamic) { T = G.anyTypeRefDynamic } else { T = G.anyTypeRef } } */
    {
        RuleFailedException previousFailure = null;
        try {
            /* expr.target === null || expr.index === null */
            if (!((expr.getTarget() == null) || (expr.getIndex() == null))) {
                sneakyThrowRuleFailedException("expr.target === null || expr.index === null");
            }
            T = TypeRefsFactory.eINSTANCE.createUnknownTypeRef();
        } catch (Exception e) {
            previousFailure = extractRuleFailedException(e);
            /* { expr.target instanceof SuperLiteral T = TypeRefsFactory.eINSTANCE.createUnknownTypeRef } or { G |- expr.target : var TypeRef targetTypeRef targetTypeRef = typeSystemHelper.resolveType(G, targetTypeRef); G |- expr.index : var TypeRef indexTypeRef; val targetDeclType = targetTypeRef.declaredType; val targetIsLiteralOfStringBasedEnum = targetDeclType instanceof TEnum && AnnotationDefinition.STRING_BASED.hasAnnotation(targetDeclType); val indexIsNumeric = { G |- indexTypeRef <: G.numberTypeRef }; val indexValue = ASTMetaInfoUtils.getCompileTimeValue(expr.index); val memberName = N4JSLanguageUtils.derivePropertyNameFromCompileTimeValue(indexValue); if (indexIsNumeric && (targetTypeRef.isArrayLike || targetIsLiteralOfStringBasedEnum)) { if (targetDeclType.generic && targetTypeRef.typeArgs.isEmpty) { T = G.anyTypeRef } else { val G2 = G.wrap typeSystemHelper.addSubstitutions(G2, targetTypeRef) G2.addThisType(targetTypeRef) val elementTypeRef = if(targetIsLiteralOfStringBasedEnum) { G.stringType.elementType } else { targetDeclType.elementType }; G2 |- elementTypeRef ~> T } } else if (memberName!==null) { val staticAccess = (targetTypeRef instanceof TypeTypeRef) val checkVisibility = false val scope = memberScopingHelper.createMemberScope(targetTypeRef, expr, checkVisibility, staticAccess) val memberDesc = if(memberName!==null && !memberName.isEmpty()) { scope.getSingleElement(qualifiedNameConverter.toQualifiedName(memberName)) }; val member = if(memberDesc!==null && !IEObjectDescriptionWithError.isErrorDescription(memberDesc)) { memberDesc.getEObjectOrProxy() }; if(member instanceof TMember && !member.eIsProxy) { G |- (member as TMember) : var TypeRef memberTypeRef val G2 = G.wrap typeSystemHelper.addSubstitutions(G2,targetTypeRef) G2.addThisType(targetTypeRef) G2 |- memberTypeRef ~> T } else if (targetTypeRef.dynamic) { T = G.anyTypeRefDynamic } else { T = TypeRefsFactory.eINSTANCE.createUnknownTypeRef } } else if (targetTypeRef.dynamic) { T = G.anyTypeRefDynamic } else { T = G.anyTypeRef } } */
            {
                try {
                    Expression _target = expr.getTarget();
                    /* expr.target instanceof SuperLiteral */
                    if (!(_target instanceof SuperLiteral)) {
                        sneakyThrowRuleFailedException("expr.target instanceof SuperLiteral");
                    }
                    T = TypeRefsFactory.eINSTANCE.createUnknownTypeRef();
                } catch (Exception e_1) {
                    previousFailure = extractRuleFailedException(e_1);
                    /* G |- expr.target : var TypeRef targetTypeRef */
                    Expression _target_1 = expr.getTarget();
                    TypeRef targetTypeRef = null;
                    Result<TypeRef> result = typeInternal(G, _trace_, _target_1);
                    checkAssignableTo(result.getFirst(), TypeRef.class);
                    targetTypeRef = (TypeRef) result.getFirst();
                    targetTypeRef = this.typeSystemHelper.resolveType(G, targetTypeRef);
                    /* G |- expr.index : var TypeRef indexTypeRef */
                    Expression _index = expr.getIndex();
                    TypeRef indexTypeRef = null;
                    Result<TypeRef> result_1 = typeInternal(G, _trace_, _index);
                    checkAssignableTo(result_1.getFirst(), TypeRef.class);
                    indexTypeRef = (TypeRef) result_1.getFirst();
                    final Type targetDeclType = targetTypeRef.getDeclaredType();
                    final boolean targetIsLiteralOfStringBasedEnum = ((targetDeclType instanceof TEnum) && AnnotationDefinition.STRING_BASED.hasAnnotation(targetDeclType));
                    /* G |- indexTypeRef <: G.numberTypeRef */
                    ParameterizedTypeRef _numberTypeRef = RuleEnvironmentExtensions.numberTypeRef(G);
                    boolean _ruleinvocation = subtypeSucceeded(G, _trace_, indexTypeRef, _numberTypeRef);
                    final boolean indexIsNumeric = _ruleinvocation;
                    final CompileTimeValue indexValue = ASTMetaInfoUtils.getCompileTimeValue(expr.getIndex());
                    final String memberName = N4JSLanguageUtils.derivePropertyNameFromCompileTimeValue(indexValue);
                    if ((indexIsNumeric && (targetTypeRef.isArrayLike() || targetIsLiteralOfStringBasedEnum))) {
                        if ((targetDeclType.isGeneric() && targetTypeRef.getTypeArgs().isEmpty())) {
                            T = RuleEnvironmentExtensions.anyTypeRef(G);
                        } else {
                            final RuleEnvironment G2 = RuleEnvironmentExtensions.wrap(G);
                            this.typeSystemHelper.addSubstitutions(G2, targetTypeRef);
                            RuleEnvironmentExtensions.addThisType(G2, targetTypeRef);
                            TypeRef _xifexpression = null;
                            if (targetIsLiteralOfStringBasedEnum) {
                                _xifexpression = RuleEnvironmentExtensions.stringType(G).getElementType();
                            } else {
                                _xifexpression = targetDeclType.getElementType();
                            }
                            final TypeRef elementTypeRef = _xifexpression;
                            /* G2 |- elementTypeRef ~> T */
                            Result<TypeArgument> result_2 = substTypeVariablesInternal(G2, _trace_, elementTypeRef);
                            checkAssignableTo(result_2.getFirst(), TypeRef.class);
                            T = (TypeRef) result_2.getFirst();
                        }
                    } else {
                        if ((memberName != null)) {
                            final boolean staticAccess = (targetTypeRef instanceof TypeTypeRef);
                            final boolean checkVisibility = false;
                            final IScope scope = this.memberScopingHelper.createMemberScope(targetTypeRef, expr, checkVisibility, staticAccess);
                            IEObjectDescription _xifexpression_1 = null;
                            if (((memberName != null) && (!memberName.isEmpty()))) {
                                _xifexpression_1 = scope.getSingleElement(this.qualifiedNameConverter.toQualifiedName(memberName));
                            }
                            final IEObjectDescription memberDesc = _xifexpression_1;
                            EObject _xifexpression_2 = null;
                            if (((memberDesc != null) && (!IEObjectDescriptionWithError.isErrorDescription(memberDesc)))) {
                                _xifexpression_2 = memberDesc.getEObjectOrProxy();
                            }
                            final EObject member = _xifexpression_2;
                            if (((member instanceof TMember) && (!member.eIsProxy()))) {
                                /* G |- (member as TMember) : var TypeRef memberTypeRef */
                                TypeRef memberTypeRef = null;
                                Result<TypeRef> result_3 = typeInternal(G, _trace_, ((TMember) member));
                                checkAssignableTo(result_3.getFirst(), TypeRef.class);
                                memberTypeRef = (TypeRef) result_3.getFirst();
                                final RuleEnvironment G2_1 = RuleEnvironmentExtensions.wrap(G);
                                this.typeSystemHelper.addSubstitutions(G2_1, targetTypeRef);
                                RuleEnvironmentExtensions.addThisType(G2_1, targetTypeRef);
                                /* G2 |- memberTypeRef ~> T */
                                Result<TypeArgument> result_4 = substTypeVariablesInternal(G2_1, _trace_, memberTypeRef);
                                checkAssignableTo(result_4.getFirst(), TypeRef.class);
                                T = (TypeRef) result_4.getFirst();
                            } else {
                                boolean _isDynamic = targetTypeRef.isDynamic();
                                if (_isDynamic) {
                                    T = RuleEnvironmentExtensions.anyTypeRefDynamic(G);
                                } else {
                                    T = TypeRefsFactory.eINSTANCE.createUnknownTypeRef();
                                }
                            }
                        } else {
                            boolean _isDynamic_1 = targetTypeRef.isDynamic();
                            if (_isDynamic_1) {
                                T = RuleEnvironmentExtensions.anyTypeRefDynamic(G);
                            } else {
                                T = RuleEnvironmentExtensions.anyTypeRef(G);
                            }
                        }
                    }
                }
            }
        }
    }
    return new Result<TypeRef>(T);
}

Example 69 with Type

use of org.eclipse.n4js.ts.types.Type in project n4js by eclipse.

the class BoundSet method resolveRawTypes.

/**
 * Handle raw types in given type bounds.
 * <p>
 * Even though raw type are not supported in N4JS, they can occur during type inference due to ClassifierTypeRef.
 * The basic idea of this method is that a raw type is removed if at least one non-raw type for the same declared
 * type exists: if we have A and A&lt;string> as upper bounds, we can remove A because it does not add any
 * information.
 * <p>
 * TODO revise handling of raw types (inefficient implementation, does not handle all cases (e.g. nested raw types))
 */
private Set<TypeBound> resolveRawTypes(Set<TypeBound> typeBounds) {
    if (// this is the 98% case, so we optimize for that
    !haveRawTypeRef)
        return typeBounds;
    if (typeBounds.isEmpty())
        return typeBounds;
    final List<TypeBound> result = new ArrayList<>(typeBounds);
    final Set<Type> genTypesWithNonRawTypeRefs = new HashSet<>();
    final Set<TypeBound> boundsWithRawTypeRef = new HashSet<>();
    // collect
    for (TypeBound tb : result) {
        if (tb.right instanceof ParameterizedTypeRef) {
            final ParameterizedTypeRef ptr = (ParameterizedTypeRef) tb.right;
            final Type declType = ptr.getDeclaredType();
            if (declType != null && declType.isGeneric()) {
                final boolean isRaw = TypeUtils.isRawTypeRef(ptr);
                if (isRaw) {
                    boundsWithRawTypeRef.add(tb);
                } else {
                    genTypesWithNonRawTypeRefs.add(declType);
                }
            }
        }
    }
    // remove all raw type bounds for which at least 1 other non-raw typeRef exists
    for (TypeBound currTB : boundsWithRawTypeRef) {
        if (genTypesWithNonRawTypeRefs.contains(currTB.right.getDeclaredType())) {
            result.remove(currTB);
        }
    }
    // remaining raw types must be sanitized
    final int len = result.size();
    for (int i = 0; i < len; i++) {
        result.set(i, result.get(i).sanitizeRawTypeRef());
    }
    return new LinkedHashSet<>(result);
}

Example 70 with Type

use of org.eclipse.n4js.ts.types.Type in project n4js by eclipse.

the class Reducer method reduceParameterizedTypeRefNominal.

/**
 * Reduction for parameterized type references according to nominal subtyping rules.
 * <p>
 * NOTE: 'left' might be a structural type reference iff variance == CO / 'right' might be structural (iff variance
 * == CONTRA) but that is irrelevant and the reduction must still follow nominal subtyping rules (because the RHS of
 * the subtype relation determines whether to use nominal or structural rules).
 */
private boolean reduceParameterizedTypeRefNominal(ParameterizedTypeRef left, ParameterizedTypeRef right, Variance variance) {
    // e.g., ⟨ Iterable3<int,string,int> :> Array<α> ⟩ should be reduced to ⟨ int >: α ⟩ and ⟨ string >: α ⟩
    if ((variance == CO && isSpecialCaseOfArraySubtypeIterableN(left, right)) || (variance == CONTRA && isSpecialCaseOfArraySubtypeIterableN(right, left))) {
        final List<TypeArgument> typeArgsOfArray = variance == CO ? left.getTypeArgs() : right.getTypeArgs();
        final List<TypeArgument> typeArgsOfIterableN = variance == CO ? right.getTypeArgs() : left.getTypeArgs();
        final List<TypeVariable> typeParamsOfIterableN = variance == CO ? right.getDeclaredType().getTypeVars() : left.getDeclaredType().getTypeVars();
        final TypeArgument singleTypeArgOfArray = !typeArgsOfArray.isEmpty() ? typeArgsOfArray.get(0) : null;
        boolean wasAdded = false;
        final int len = Math.min(typeArgsOfIterableN.size(), typeParamsOfIterableN.size());
        for (int idx = 0; idx < len; idx++) {
            TypeArgument currTypeArgOfIterableN = typeArgsOfIterableN.get(idx);
            TypeVariable curTypeParamOfIterableN = typeParamsOfIterableN.get(idx);
            wasAdded |= reduceConstraintForTypeArgumentPair(currTypeArgOfIterableN, curTypeParamOfIterableN, singleTypeArgOfArray);
        }
        return wasAdded;
    }
    // standard cases:
    final TypeRef leftRaw = TypeUtils.createTypeRef(left.getDeclaredType());
    // note: enforcing nominal here!
    final TypeRef rightRaw = TypeUtils.createTypeRef(right.getDeclaredType());
    if ((variance == CO && !ts.subtypeSucceeded(G, leftRaw, rightRaw)) || (variance == CONTRA && !ts.subtypeSucceeded(G, rightRaw, leftRaw)) || (variance == INV && !ts.equaltypeSucceeded(G, leftRaw, rightRaw))) {
        return giveUp(left, right, variance);
    }
    // IV <-> string
    if (variance == CO) {
        // normalize ⟨ B <: A ⟩ to ⟨ A :> B ⟩ to make sure the (raw) subtype is on the right-hand side
        final ParameterizedTypeRef tmp = left;
        left = right;
        right = tmp;
        variance = CONTRA;
    }
    boolean wasAdded = false;
    final RuleEnvironment Gx = RuleEnvironmentExtensions.newRuleEnvironment(G);
    tsh.addSubstitutions(Gx, right);
    final Type leftType = left.getDeclaredType();
    final List<TypeArgument> leftArgs = left.getTypeArgs();
    final List<TypeVariable> leftParams = leftType.getTypeVars();
    final int len = Math.min(leftArgs.size(), leftParams.size());
    for (int idx = 0; idx < len; ++idx) {
        final TypeArgument leftArg = leftArgs.get(idx);
        final TypeVariable leftParam = leftParams.get(idx);
        if (RuleEnvironmentExtensions.hasSubstitutionFor(Gx, leftParam)) {
            final TypeArgument leftParamSubst = ts.substTypeVariables(Gx, TypeUtils.createTypeRef(leftParam)).getValue();
            wasAdded |= reduceConstraintForTypeArgumentPair(leftArg, leftParam, leftParamSubst);
        }
    }
    return wasAdded;
}