7 files changed, 63 insertions, 9 deletions
diff --git a/tests/auto/qml/qmllint/data/badTypeAssertion.qml b/tests/auto/qml/qmllint/data/badTypeAssertion.qml
new file mode 100644
index 0000000000..717fc1b1bb
--- /dev/null
+++ b/tests/auto/qml/qmllint/data/badTypeAssertion.qml
@@ -0,0 +1,6 @@
+import QtQuick 2.0
+
+Item {
+    property QtObject foo: Item { x: 4 }
+    property real foox: (foo as Item).rrr
+}
diff --git a/tests/auto/qml/qmllint/data/goodTypeAssertion.qml b/tests/auto/qml/qmllint/data/goodTypeAssertion.qml
new file mode 100644
index 0000000000..6f5f52eb6b
--- /dev/null
+++ b/tests/auto/qml/qmllint/data/goodTypeAssertion.qml
@@ -0,0 +1,6 @@
+import QtQuick 2.0
+
+Item {
+    property QtObject foo: Item { x: 4 }
+    property real foox: (foo as Item).x
+}
diff --git a/tests/auto/qml/qmllint/tst_qmllint.cpp b/tests/auto/qml/qmllint/tst_qmllint.cpp
index f906c3ac45..655e6a1d65 100644
--- a/tests/auto/qml/qmllint/tst_qmllint.cpp
+++ b/tests/auto/qml/qmllint/tst_qmllint.cpp
@@ -156,6 +156,10 @@ void TestQmllint::dirtyQmlCode_data()
             << QStringLiteral("parentIsComponent.qml")
             << QString("Warning: Property \"progress\" not found on type \"QQuickItem\" at 7:39")
             << QString();
+    QTest::newRow("badTypeAssertion")
+            << QStringLiteral("badTypeAssertion.qml")
+            << QString("Warning: Property \"rrr\" not found on type \"Item\" at 5:39")
+            << QString();
 }
 
 void TestQmllint::dirtyQmlCode()
@@ -186,6 +190,7 @@ void TestQmllint::cleanQmlCode_data()
     QTest::newRow("methodsInJavascript")       << QStringLiteral("javascriptMethods.qml");
     QTest::newRow("goodAlias")                 << QStringLiteral("goodAlias.qml");
     QTest::newRow("goodParent")                << QStringLiteral("goodParent.qml");
+    QTest::newRow("goodTypeAssertion")         << QStringLiteral("goodTypeAssertion.qml");
 }
 
 void TestQmllint::cleanQmlCode()
diff --git a/tools/qmllint/findunqualified.cpp b/tools/qmllint/findunqualified.cpp
index d0dc3a3711..dc1bb29567 100644
--- a/tools/qmllint/findunqualified.cpp
+++ b/tools/qmllint/findunqualified.cpp
@@ -900,11 +900,37 @@ bool FindUnqualifiedIDVisitor::visit(QQmlJS::AST::FieldMemberExpression *)
 
 void FindUnqualifiedIDVisitor::endVisit(QQmlJS::AST::FieldMemberExpression *fieldMember)
 {
-    if (m_fieldMemberBase == fieldMember->base) {
+    using namespace QQmlJS::AST;
+    ExpressionNode *base = fieldMember->base;
+    while (auto *nested = cast<NestedExpression *>(base))
+        base = nested->expression;
+
+    if (m_fieldMemberBase == base) {
+        QString type;
+        if (auto *binary = cast<BinaryExpression *>(base)) {
+            if (binary->op == QSOperator::As) {
+                if (auto *right = cast<IdentifierExpression *>(binary->right))
+                    type = right->name.toString();
+            }
+        }
         m_currentScope->accessMember(fieldMember->name.toString(),
+                                     type,
                                      fieldMember->identifierToken);
         m_fieldMemberBase = fieldMember;
     } else {
         m_fieldMemberBase = nullptr;
     }
 }
+
+bool FindUnqualifiedIDVisitor::visit(QQmlJS::AST::BinaryExpression *)
+{
+    return true;
+}
+
+void FindUnqualifiedIDVisitor::endVisit(QQmlJS::AST::BinaryExpression *binExp)
+{
+    if (binExp->op == QSOperator::As && m_fieldMemberBase == binExp->left)
+        m_fieldMemberBase = binExp;
+    else
+        m_fieldMemberBase = nullptr;
+}
diff --git a/tools/qmllint/findunqualified.h b/tools/qmllint/findunqualified.h
index f5955a3a74..6668b53b08 100644
--- a/tools/qmllint/findunqualified.h
+++ b/tools/qmllint/findunqualified.h
@@ -161,6 +161,9 @@ private:
     bool visit(QQmlJS::AST::PatternElement *) override;
     bool visit(QQmlJS::AST::FieldMemberExpression *idprop) override;
     void endVisit(QQmlJS::AST::FieldMemberExpression *) override;
+
+    bool visit(QQmlJS::AST::BinaryExpression *) override;
+    void endVisit(QQmlJS::AST::BinaryExpression *) override;
 };
 
 #endif // FINDUNQUALIFIED_H
diff --git a/tools/qmllint/scopetree.cpp b/tools/qmllint/scopetree.cpp
index e5b0eecc5f..6c122f0368 100644
--- a/tools/qmllint/scopetree.cpp
+++ b/tools/qmllint/scopetree.cpp
@@ -88,14 +88,15 @@ bool ScopeTree::isIdInCurrentScope(const QString &id) const
 }
 
 void ScopeTree::addIdToAccessed(const QString &id, const QQmlJS::AST::SourceLocation &location) {
-    m_currentFieldMember = new FieldMemberList {id, location, {}};
+    m_currentFieldMember = new FieldMemberList {id, QString(), location, {}};
     m_accessedIdentifiers.push_back(std::unique_ptr<FieldMemberList>(m_currentFieldMember));
 }
 
-void ScopeTree::accessMember(const QString &name, const QQmlJS::AST::SourceLocation &location)
+void ScopeTree::accessMember(const QString &name, const QString &parentType,
+                             const QQmlJS::AST::SourceLocation &location)
 {
     Q_ASSERT(m_currentFieldMember);
-    auto *fieldMember = new FieldMemberList {name, location, {}};
+    auto *fieldMember = new FieldMemberList {name, parentType, location, {}};
     m_currentFieldMember->m_child.reset(fieldMember);
     m_currentFieldMember = fieldMember;
 }
@@ -150,7 +151,9 @@ bool ScopeTree::checkMemberAccess(
 
     const auto scopeIt = scope->m_properties.find(access->m_name);
     if (scopeIt != scope->m_properties.end()) {
-        if (scopeIt->isList() || scopeIt->typeName() == QLatin1String("string")) {
+        const QString typeName = access->m_parentType.isEmpty() ? scopeIt->typeName()
+                                                                : access->m_parentType;
+        if (scopeIt->isList() || typeName == QLatin1String("string")) {
             if (access->m_child && access->m_child->m_name != QLatin1String("length")) {
                 colorOut.write("Warning: ", Warning);
                 colorOut.write(
@@ -166,8 +169,9 @@ bool ScopeTree::checkMemberAccess(
             }
             return true;
         }
-        const ScopeTree *type = scopeIt->type() ? scopeIt->type()
-                                                : types.value(scopeIt->typeName()).get();
+        const ScopeTree *type = (scopeIt->type() && access->m_parentType.isEmpty())
+                ? scopeIt->type()
+                : types.value(typeName).get();
         return checkMemberAccess(code, access.get(), type, types, colorOut);
     }
 
@@ -199,7 +203,9 @@ bool ScopeTree::checkMemberAccess(
     while (type) {
         const auto typeIt = type->m_properties.find(access->m_name);
         if (typeIt != type->m_properties.end()) {
-            const auto propType = typeIt->type();
+            const ScopeTree *propType = access->m_parentType.isEmpty()
+                    ? typeIt->type()
+                    : types.value(access->m_parentType).get();
             return checkMemberAccess(code, access.get(),
                                      propType ? propType : types.value(typeIt->typeName()).get(),
                                      types, colorOut);
diff --git a/tools/qmllint/scopetree.h b/tools/qmllint/scopetree.h
index eb5f384477..f5d1155a49 100644
--- a/tools/qmllint/scopetree.h
+++ b/tools/qmllint/scopetree.h
@@ -120,7 +120,8 @@ public:
 
     bool isIdInCurrentScope(const QString &id) const;
     void addIdToAccessed(const QString &id, const QQmlJS::AST::SourceLocation &location);
-    void accessMember(const QString &name, const QQmlJS::AST::SourceLocation &location);
+    void accessMember(const QString &name, const QString &parentType,
+                      const QQmlJS::AST::SourceLocation &location);
     void resetMemberScope();
 
     bool isVisualRootScope() const;
@@ -172,6 +173,7 @@ private:
     struct FieldMemberList
     {
         QString m_name;
+        QString m_parentType;
         QQmlJS::AST::SourceLocation m_location;
         std::unique_ptr<FieldMemberList> m_child;
     };