Linter Demo

Errors: 1

Warnings: 6

File: /home/fstrocco/Dart/dart/benchmark/devcompiler/lib/src/checker/rules.dart

// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file // for details. All rights reserved. Use of this source code is governed by a // BSD-style license that can be found in the LICENSE file. library dev_compiler.src.checker.rules; import 'package:analyzer/src/generated/ast.dart'; import 'package:analyzer/src/generated/element.dart'; import 'package:analyzer/src/generated/resolver.dart'; import 'package:dev_compiler/src/info.dart'; import 'package:dev_compiler/src/utils.dart' as utils; import 'package:dev_compiler/strong_mode.dart' show StrongModeOptions; abstract class TypeRules { final TypeProvider provider; LibraryInfo currentLibraryInfo = null; /// Map of fields / properties / methods on Object. final Map<String, DartType> objectMembers; TypeRules(TypeProvider provider) : provider = provider, objectMembers = utils.getObjectMemberMap(provider); MissingTypeReporter reportMissingType; bool isSubTypeOf(DartType t1, DartType t2); bool isAssignable(DartType t1, DartType t2); bool isGroundType(DartType t) => true; // TODO(vsm): The default implementation is not ignoring the return type, // only the restricted override is. bool isFunctionSubTypeOf(FunctionType f1, FunctionType f2, {bool fuzzyArrows: true, bool ignoreReturn: false}) => isSubTypeOf(f1, f2); bool isBoolType(DartType t) => t == provider.boolType; bool isDoubleType(DartType t) => t == provider.doubleType; bool isIntType(DartType t) => t == provider.intType; bool isNumType(DartType t) => t == provider.intType.superclass; bool isStringType(DartType t) => t == provider.stringType; bool isNonNullableType(DartType t) => false; bool maybeNonNullableType(DartType t) => false; StaticInfo checkAssignment(Expression expr, DartType t, bool constContext); DartType getStaticType(Expression expr) => expr.staticType; /// Given a type t, if t is an interface type with a call method /// defined, return the function type for the call method, otherwise /// return null. FunctionType getCallMethodType(DartType t) { if (t is InterfaceType) { ClassElement element = t.element; InheritanceManager manager = new InheritanceManager(element.library); FunctionType callType = manager.lookupMemberType(t, "call"); return callType; } return null; } /// Given an expression, return its type assuming it is /// in the caller position of a call (that is, accounting /// for the possibility of a call method). Returns null /// if expression is not statically callable. FunctionType getTypeAsCaller(Expression applicand) { var t = getStaticType(applicand); if (t is InterfaceType) { return getCallMethodType(t); } if (t is FunctionType) return t; return null; } DartType elementType(Element e); bool isDynamicTarget(Expression expr); bool isDynamicCall(Expression call); } // TODO(jmesserly): this is unused. class DartRules extends TypeRules { DartRules(TypeProvider provider) : super(provider); MissingTypeReporter reportMissingType = null; bool isSubTypeOf(DartType t1, DartType t2) { return t1.isSubtypeOf(t2); } bool isAssignable(DartType t1, DartType t2) { return t1.isAssignableTo(t2); } StaticInfo checkAssignment( Expression expr, DartType toType, bool constContext) { final fromType = getStaticType(expr); if (!isAssignable(fromType, toType)) { return new StaticTypeError(this, expr, toType); } return null; } DartType elementType(Element e) { return (e as dynamic).type; } /// By default, all invocations are dynamic in Dart. bool isDynamic(DartType t) => true; bool isDynamicTarget(Expression expr) => true; bool isDynamicCall(Expression call) => true; } typedef void MissingTypeReporter(Expression expr); class RestrictedRules extends TypeRules { MissingTypeReporter reportMissingType = null; final StrongModeOptions options; final List<DartType> _nonnullableTypes; DownwardsInference inferrer; DartType _typeFromName(String name) { switch (name) { case 'int': return provider.intType; case 'double': return provider.doubleType; case 'num': return provider.numType; case 'bool': return provider.boolType; case 'String': return provider.stringType; default: throw new UnsupportedError('Unsupported non-nullable type $name'); } } RestrictedRules(TypeProvider provider, {this.options}) : _nonnullableTypes = <DartType>[], super(provider) { var types = options.nonnullableTypes; _nonnullableTypes.addAll(types.map(_typeFromName)); inferrer = new DownwardsInference(this); } DartType getStaticType(Expression expr) { var type = expr.staticType; if (type != null) return type; if (reportMissingType != null) reportMissingType(expr); return provider.dynamicType; } bool _isBottom(DartType t, {bool dynamicIsBottom: false}) { if (t.isDynamic && dynamicIsBottom) return true; // TODO(vsm): We need direct support for non-nullability in DartType. // This should check on "true/nonnullable" Bottom if (t.isBottom && _nonnullableTypes.isEmpty) return true; return false; } bool _isTop(DartType t, {bool dynamicIsBottom: false}) { if (t.isDynamic && !dynamicIsBottom) return true; if (t.isObject) return true; return false; } bool isNonNullableType(DartType t) => _nonnullableTypes.contains(t); bool maybeNonNullableType(DartType t) { // Return true iff t *may* be a primitive type. // If t is a generic type parameter, return true if it may be // instantiated as a primitive. if (isNonNullableType(t)) { return true; } else if (t is TypeParameterType) { var bound = t.element.bound; if (bound == null) { bound = provider.dynamicType; } return _nonnullableTypes.any((DartType p) => isSubTypeOf(p, bound)); } else { return false; } } bool _anyParameterType(FunctionType ft, bool predicate(DartType t)) { return ft.normalParameterTypes.any(predicate) || ft.optionalParameterTypes.any(predicate) || ft.namedParameterTypes.values.any(predicate); } // TODO(leafp): Revisit this. bool isGroundType(DartType t) { if (t is TypeParameterType) return false; if (_isTop(t)) return true; if (t is FunctionType) { if (!_isTop(t.returnType) || _anyParameterType(t, (pt) => !_isBottom(pt, dynamicIsBottom: true))) { return false; } else { return true; } } if (t is InterfaceType) { var typeArguments = t.typeArguments; for (var typeArgument in typeArguments) { if (!_isTop(typeArgument)) return false; } return true; } throw new StateError("Unexpected type"); } /// Check that f1 is a subtype of f2. [ignoreReturn] is used in the DDC /// checker to determine whether f1 would be a subtype of f2 if the return /// type of f1 is set to match f2's return type. // [fuzzyArrows] indicates whether or not the f1 and f2 should be // treated as fuzzy arrow types (and hence dynamic parameters to f2 treated as // bottom). bool isFunctionSubTypeOf(FunctionType f1, FunctionType f2, {bool fuzzyArrows: true, bool ignoreReturn: false}) { final r1s = f1.normalParameterTypes; final o1s = f1.optionalParameterTypes; final n1s = f1.namedParameterTypes; final r2s = f2.normalParameterTypes; final o2s = f2.optionalParameterTypes; final n2s = f2.namedParameterTypes; final ret1 = ignoreReturn ? f2.returnType : f1.returnType; final ret2 = f2.returnType; // A -> B <: C -> D if C <: A and // either D is void or B <: D if (!ret2.isVoid && !isSubTypeOf(ret1, ret2)) return false; // Reject if one has named and the other has optional if (n1s.length > 0 && o2s.length > 0) return false; if (n2s.length > 0 && o1s.length > 0) return false; // f2 has named parameters if (n2s.length > 0) { // Check that every named parameter in f2 has a match in f1 for (String k2 in n2s.keys) { if (!n1s.containsKey(k2)) return false; if (!isSubTypeOf(n2s[k2], n1s[k2], dynamicIsBottom: fuzzyArrows)) return false; } } // If we get here, we either have no named parameters, // or else the named parameters match and we have no optional // parameters // If f1 has more required parameters, reject if (r1s.length > r2s.length) return false; // If f2 has more required + optional parameters, reject if (r2s.length + o2s.length > r1s.length + o1s.length) return false; // The parameter lists must look like the following at this point // where rrr is a region of required, and ooo is a region of optionals. // f1: rrr ooo ooo ooo // f2: rrr rrr ooo int rr = r1s.length; // required in both int or = r2s.length - r1s.length; // optional in f1, required in f2 int oo = o2s.length; // optional in both for (int i = 0; i < rr; ++i) { if (!isSubTypeOf(r2s[i], r1s[i], dynamicIsBottom: fuzzyArrows)) return false; } for (int i = 0, j = rr; i < or; ++i, ++j) { if (!isSubTypeOf(r2s[j], o1s[i], dynamicIsBottom: fuzzyArrows)) return false; } for (int i = or, j = 0; i < oo; ++i, ++j) { if (!isSubTypeOf(o2s[j], o1s[i], dynamicIsBottom: fuzzyArrows)) return false; } return true; } bool _isInterfaceSubTypeOf(InterfaceType i1, InterfaceType i2) { if (i1 == i2) return true; if (i1.element == i2.element) { List<DartType> tArgs1 = i1.typeArguments; List<DartType> tArgs2 = i2.typeArguments; // TODO(leafp): Verify that this is always true // Do raw types get filled in? assert(tArgs1.length == tArgs2.length); for (int i = 0; i < tArgs1.length; i++) { DartType t1 = tArgs1[i]; DartType t2 = tArgs2[i]; if (!isSubTypeOf(t1, t2)) return false; } return true; } if (i2.isDartCoreFunction) { if (i1.element.getMethod("call") != null) return true; } if (i1 == provider.objectType) return false; if (_isInterfaceSubTypeOf(i1.superclass, i2)) return true; for (final parent in i1.interfaces) { if (_isInterfaceSubTypeOf(parent, i2)) return true; } for (final parent in i1.mixins) { if (_isInterfaceSubTypeOf(parent, i2)) return true; } return false; } bool isSubTypeOf(DartType t1, DartType t2, {bool dynamicIsBottom: false}) { if (t1 == t2) return true; // Trivially true. if (_isTop(t2, dynamicIsBottom: dynamicIsBottom) || _isBottom(t1, dynamicIsBottom: dynamicIsBottom)) { return true; } // Trivially false. if (_isTop(t1, dynamicIsBottom: dynamicIsBottom) || _isBottom(t2, dynamicIsBottom: dynamicIsBottom)) { return false; } // The null type is a subtype of any nonnullable type. // TODO(vsm): Note, t1.isBottom still allows for null confusingly. // _isBottom(t1) does not necessarily imply t1.isBottom if there are // nonnullable types in the system. if (t1.isBottom) { // Return false iff t2 *may* be a primitive type. return !maybeNonNullableType(t2); } // S <: T where S is a type variable // T is not dynamic or object (handled above) // S != T (handled above) // So only true if bound of S is S' and // S' <: T if (t1 is TypeParameterType) { DartType bound = t1.element.bound; if (bound == null) return false; return isSubTypeOf(bound, t2); } if (t2.isDartCoreFunction) { if (t1 is FunctionType) return true; if (t1.element is ClassElement) { if ((t1.element as ClassElement).getMethod("call") != null) return true; } } // "Traditional" name-based subtype check. if (t1 is InterfaceType && t2 is InterfaceType) { return _isInterfaceSubTypeOf(t1, t2); } if (t1 is! FunctionType && t2 is! FunctionType) return false; if (t1 is InterfaceType && t2 is FunctionType) { var callType = getCallMethodType(t1); if (callType == null) return false; return isFunctionSubTypeOf(callType, t2); } if (t1 is FunctionType && t2 is InterfaceType) { return false; } // Functions // Note: it appears under the hood all Dart functions map to a class / // hidden type that: // (a) subtypes Object (an internal _FunctionImpl in the VM) // (b) implements Function // (c) provides standard Object members (hashCode, toString) // (d) contains private members (corresponding to _FunctionImpl?) // (e) provides a call method to handle the actual function invocation // // The standard Dart subtyping rules are structural in nature. I.e., // bivariant on arguments and return type. // // The below tries for a more traditional subtyping rule: // - covariant on return type // - contravariant on parameters // - 'sensible' (?) rules on optional and/or named params // but doesn't properly mix with class subtyping. I suspect Java 8 lambdas // essentially map to dynamic (and rely on invokedynamic) due to similar // issues. return isFunctionSubTypeOf(t1 as FunctionType, t2 as FunctionType); } bool isAssignable(DartType t1, DartType t2) { return isSubTypeOf(t1, t2); } // Produce a coercion which coerces something of type fromT // to something of type toT. // If wrap is true and both are function types, a closure // wrapper coercion is produced using _wrapTo (see above) // Returns the error coercion if the types cannot be coerced // according to our current criteria. Coercion _coerceTo(DartType fromT, DartType toT) { // We can use anything as void if (toT.isVoid) return Coercion.identity(toT); // fromT <: toT, no coercion needed if (isSubTypeOf(fromT, toT)) return Coercion.identity(toT); // For now, reject conversions between function types and // call method objects. We could choose to allow casts here. // Wrapping a function type to assign it to a call method // object will never succeed. Wrapping the other way could // be allowed. if ((fromT is FunctionType && getCallMethodType(toT) != null) || (toT is FunctionType && getCallMethodType(fromT) != null)) { return Coercion.error(); } // Downcast if toT <: fromT if (isSubTypeOf(toT, fromT)) return Coercion.cast(fromT, toT); // Downcast if toT <===> fromT // The intention here is to allow casts that are sideways in the restricted // type system, but allowed in the regular dart type system, since these // are likely to succeed. The canonical example is List<dynamic> and // Iterable<T> for some concrete T (e.g. Object). These are unrelated // in the restricted system, but List<dynamic> <: Iterable<T> in dart. if (options.relaxedCasts && fromT.isAssignableTo(toT)) { return Coercion.cast(fromT, toT); } return Coercion.error(); } StaticInfo checkAssignment(Expression expr, DartType toT, bool constContext) { final fromT = getStaticType(expr); final Coercion c = _coerceTo(fromT, toT); if (c is Identity) return null; if (c is CoercionError) return new StaticTypeError(this, expr, toT); var reason = null; if (options.inferDownwards) { var errors = <String>[]; var ok = inferrer.inferExpression(expr, toT, errors); if (ok) return InferredType.create(this, expr, toT); reason = (errors.isNotEmpty) ? errors.first : null; } if (c is Cast) return DownCast.create(this, expr, c, reason: reason); assert(false); return null; } DartType elementType(Element e) { return (e as dynamic).type; } /// Returns `true` if the target expression is dynamic. // TODO(jmesserly): remove this in favor of utils? Or a static method here? bool isDynamicTarget(Expression target) => utils.isDynamicTarget(target); /// Returns `true` if the expression is a dynamic function call or method /// invocation. bool isDynamicCall(Expression call) { var t = getTypeAsCaller(call); // TODO(leafp): This will currently return true if t is Function // This is probably the most correct thing to do for now, since // this code is also used by the back end. Maybe revisit at some // point? if (t == null) return true; // Dynamic as the parameter type is treated as bottom. A function with // a dynamic parameter type requires a dynamic call in general. // However, as an optimization, if we have an original definition, we know // dynamic is reified as Object - in this case a regular call is fine. if (call is SimpleIdentifier) { var element = call.staticElement; if (element is FunctionElement || element is MethodElement) { // An original declaration. return false; } } var ft = t as FunctionType; return _anyParameterType(ft, (pt) => pt.isDynamic); } } class DownwardsInference { final TypeRules rules; DownwardsInference(this.rules); /// Called for each list literal which gets inferred void annotateListLiteral(ListLiteral e, List<DartType> targs) {} /// Called for each map literal which gets inferred void annotateMapLiteral(MapLiteral e, List<DartType> targs) {} /// Called for each new/const which gets inferred void annotateInstanceCreationExpression( InstanceCreationExpression e, List<DartType> targs) {} /// Called for cast from dynamic required for inference to succeed void annotateCastFromDynamic(Expression e, DartType t) {} /// Called for each function expression return type inferred void annotateFunctionExpression(FunctionExpression e, DartType returnType) {} /// Downward inference bool inferExpression(Expression e, DartType t, List<String> errors) { // Don't cast top level expressions, only sub-expressions return _inferExpression(e, t, errors, cast: false); } /// Downward inference bool _inferExpression(Expression e, DartType t, List<String> errors, {cast: true}) { if (e is ConditionalExpression) { return _inferConditionalExpression(e, t, errors); } if (e is ParenthesizedExpression) { return _inferParenthesizedExpression(e, t, errors); } if (rules.isSubTypeOf(rules.getStaticType(e), t)) return true; if (cast && rules.getStaticType(e).isDynamic) { annotateCastFromDynamic(e, t); return true; } if (e is FunctionExpression) return _inferFunctionExpression(e, t, errors); if (e is ListLiteral) return _inferListLiteral(e, t, errors); if (e is MapLiteral) return _inferMapLiteral(e, t, errors); if (e is NamedExpression) return _inferNamedExpression(e, t, errors); if (e is InstanceCreationExpression) { return _inferInstanceCreationExpression(e, t, errors); } errors.add("$e cannot be typed as $t"); return false; } /// If t1 = I<dynamic, ..., dynamic>, then look for a supertype /// of t1 of the form K<S0, ..., Sm> where t2 = K<S0', ..., Sm'> /// If the supertype exists, use the constraints S0 <: S0', ... Sm <: Sm' /// to derive a concrete instantation for I of the form <T0, ..., Tn>, /// such that I<T0, .., Tn> <: t2 List<DartType> _matchTypes(InterfaceType t1, InterfaceType t2) { if (t1 == t2) return t2.typeArguments; var tArgs1 = t1.typeArguments; var tArgs2 = t2.typeArguments; // If t1 isn't a raw type, bail out if (tArgs1 != null && tArgs1.any((t) => !t.isDynamic)) return null; // This is our inferred type argument list. We start at all dynamic, // and fill in with inferred types when we reach a match. var actuals = new List<DartType>.filled(tArgs1.length, rules.provider.dynamicType); // When we find the supertype of t1 with the same // classname as t2 (see below), we have the following: // If t1 is an instantiation of a class T1<X0, ..., Xn> // and t2 is an instantiation of a class T2<Y0, ...., Ym> // of the form t2 = T2<S0, ..., Sm> // then we want to choose instantiations for the Xi // T0, ..., Tn such that T1<T0, ..., Tn> <: t2 . // To find this, we simply instantate T1 with // X0, ..., Xn, and then find its superclass // T2<T0', ..., Tn'>. We then solve the constraint // set T0' <: S0, ..., Tn' <: Sn for the Xi. // Currently, we only handle constraints where // the Ti' is one of the Xi'. If there are multiple // constraints on some Xi, we choose the lower of the // two (if it exists). bool permute(List<DartType> permutedArgs) { if (permutedArgs == null) return false; var ps = t1.typeParameters; var ts = ps.map((p) => p.type).toList(); for (int i = 0; i < permutedArgs.length; i++) { var tVar = permutedArgs[i]; var tActual = tArgs2[i]; var index = ts.indexOf(tVar); if (index >= 0 && rules.isSubTypeOf(tActual, actuals[index])) { actuals[index] = tActual; } } return actuals.any((x) => !x.isDynamic); } // Look for the first supertype of t1 with the same class name as t2. bool match(InterfaceType t1) { if (t1.element == t2.element) { return permute(t1.typeArguments); } if (t1 == rules.provider.objectType) return false; if (match(t1.superclass)) return true; for (final parent in t1.interfaces) { if (match(parent)) return true; } for (final parent in t1.mixins) { if (match(parent)) return true; } return false; } // We have that t1 = T1<dynamic, ..., dynamic>. // To match t1 against t2, we use the uninstantiated version // of t1, essentially treating it as an instantiation with // fresh variables, and solve for the variables. // t1.element.type will be of the form T1<X0, ..., Xn> if (!match(t1.element.type)) return null; var newT1 = t1.element.type.substitute4(actuals); // If we found a solution, return it. if (rules.isSubTypeOf(newT1, t2)) return actuals; return null; } /// These assume that e is not already a subtype of t bool _inferConditionalExpression( ConditionalExpression e, DartType t, errors) { return _inferExpression(e.thenExpression, t, errors) && _inferExpression(e.elseExpression, t, errors); } bool _inferParenthesizedExpression( ParenthesizedExpression e, DartType t, errors) { return _inferExpression(e.expression, t, errors); } bool _inferInstanceCreationExpression( InstanceCreationExpression e, DartType t, errors) { var arguments = e.argumentList.arguments; var rawType = rules.getStaticType(e); // rawType is the instantiated type of the instance if (rawType is! InterfaceType) return false; var type = (rawType as InterfaceType); if (type.typeParameters == null || type.typeParameters.length == 0) return false; if (e.constructorName.type == null) return false; // classTypeName is the type name of the class being instantiated var classTypeName = e.constructorName.type; // Check that we were not passed any type arguments if (classTypeName.typeArguments != null) return false; // Infer type arguments var targs = _matchTypes(type, t); if (targs == null) return false; if (e.staticElement == null) return false; var constructorElement = e.staticElement; // From the constructor element get: // the instantiated type of the constructor, then // the uninstantiated element for the constructor, then // the uninstantiated type for the constructor var rawConstructorElement = constructorElement.type.element as ConstructorElement; var baseType = rawConstructorElement.type; if (baseType == null) return false; // From the interface type (instantiated), get: // the uninstantiated element, then // the uninstantiated type, then // the type arguments (aka the type parameters) var tparams = type.element.type.typeArguments; // Take the uninstantiated constructor type, and replace the type // parameters with the inferred arguments. var fType = baseType.substitute2(targs, tparams); { var rTypes = fType.normalParameterTypes; var oTypes = fType.optionalParameterTypes; var pTypes = new List.from(rTypes)..addAll(oTypes); var pArgs = arguments.where((x) => x is! NamedExpression); var pi = 0; for (var arg in pArgs) { if (pi >= pTypes.length) return false; var argType = pTypes[pi]; if (!_inferExpression(arg, argType, errors)) return false; pi++; } var nTypes = fType.namedParameterTypes; for (var arg0 in arguments) { if (arg0 is! NamedExpression) continue; var arg = arg0 as NamedExpression; SimpleIdentifier nameNode = arg.name.label; String name = nameNode.name; var argType = nTypes[name]; if (argType == null) return false; if (!_inferExpression(arg, argType, errors)) return false; } } annotateInstanceCreationExpression(e, targs); return true; } bool _inferNamedExpression(NamedExpression e, DartType t, errors) { return _inferExpression(e.expression, t, errors); } bool _inferFunctionExpression(FunctionExpression e, DartType t, errors) { if (t is! FunctionType) return false; var fType = t as FunctionType; var eType = e.staticType as FunctionType; if (eType is! FunctionType) return false; // We have a function literal, so we can treat the arrow type // as non-fuzzy. Since we're not improving on parameter types // currently, if this check fails then we cannot succeed, so // bail out. Otherwise, we never need to check the parameter types // again. if (!rules.isFunctionSubTypeOf(eType, fType, fuzzyArrows: false, ignoreReturn: true)) return false; // This only entered inference because of fuzzy typing. // The function type is already specific enough, we can just // succeed and treat it as a successful inference if (rules.isSubTypeOf(eType.returnType, fType.returnType)) return true; // Fuzzy typing again, handle the void case (not caught by the previous) if (fType.returnType.isVoid) return true; if (e.body is! ExpressionFunctionBody) return false; var body = (e.body as ExpressionFunctionBody).expression; if (!_inferExpression(body, fType.returnType, errors)) return false; // TODO(leafp): Try narrowing the argument types if possible // to get better code in the function body. This requires checking // that the body is well-typed at the more specific type. // At this point, we know that the parameter types are in the appropriate subtype // relation, and we have checked that we can type the body at the appropriate return // type, so we can are done. annotateFunctionExpression(e, fType.returnType); return true; } bool _inferListLiteral(ListLiteral e, DartType t, errors) { var dyn = rules.provider.dynamicType; var listT = rules.provider.listType.substitute4([dyn]); // List <: t (using dart rules) must be true if (!listT.isSubtypeOf(t)) return false; // The list literal must have no type arguments if (e.typeArguments != null) return false; if (t is! InterfaceType) return false; var targs = _matchTypes(listT, t); if (targs == null) return false; assert(targs.length == 1); var etype = targs[0]; assert(!etype.isDynamic); var elements = e.elements; var b = elements.every((e) => _inferExpression(e, etype, errors)); if (b) annotateListLiteral(e, targs); return b; } bool _inferMapLiteral(MapLiteral e, DartType t, errors) { var dyn = rules.provider.dynamicType; var mapT = rules.provider.mapType.substitute4([dyn, dyn]); // Map <: t (using dart rules) must be true if (!mapT.isSubtypeOf(t)) return false; // The map literal must have no type arguments if (e.typeArguments != null) return false; if (t is! InterfaceType) return false; var targs = _matchTypes(mapT, t); if (targs == null) return false; assert(targs.length == 2); var kType = targs[0]; var vType = targs[1]; assert(!(kType.isDynamic && vType.isDynamic)); var entries = e.entries; bool inferEntry(MapLiteralEntry entry) { return _inferExpression(entry.key, kType, errors) && _inferExpression(entry.value, vType, errors); } var b = entries.every(inferEntry); if (b) annotateMapLiteral(e, targs); return b; } }