1 files changed, 8 insertions, 3 deletions
diff --git a/src/qml/jsruntime/qv4script.cpp b/src/qml/jsruntime/qv4script.cpp
index d8f6ebbf48..357f638031 100644
--- a/src/qml/jsruntime/qv4script.cpp
+++ b/src/qml/jsruntime/qv4script.cpp
@@ -55,9 +55,14 @@ void Script::parse()
 
     if (sourceCode.startsWith(QLatin1String("function("))) {
         static const int snippetLength = 70;
-        qWarning() << "Warning: Using function expressions as statements in scripts is not compliant with the ECMAScript specification:\n"
-                   << (QStringView{sourceCode}.left(snippetLength) + QLatin1String("..."))
-                   << "\nThis will throw a syntax error in Qt 5.12. If you want a function expression, surround it by parentheses.";
+        v4->throwSyntaxError(
+                QLatin1String(
+                        "Using function expressions as statements in scripts is not compliant "
+                        "with the ECMAScript specification:"
+                        "\n%1...\n"
+                        "If you want a function expression, surround it by parentheses.")
+                        .arg(QStringView{sourceCode}.left(snippetLength)));
+        return;
     }
 
     Engine ee, *engine = &ee;