1 files changed, 23 insertions, 0 deletions
diff --git a/src/qml/jsruntime/qv4jscall.cpp b/src/qml/jsruntime/qv4jscall.cpp
index 350e0fe542..513ae59145 100644
--- a/src/qml/jsruntime/qv4jscall.cpp
+++ b/src/qml/jsruntime/qv4jscall.cpp
@@ -3,6 +3,8 @@
 
 #include "qv4jscall_p.h"
 
+#include <QtQml/qqmlinfo.h>
+
 #include <private/qqmlengine_p.h>
 #include <private/qv4qobjectwrapper_p.h>
 
@@ -20,4 +22,25 @@ void QV4::populateJSCallArguments(ExecutionEngine *v4, JSCallArguments &jsCall,
         jsCall.args[ii] = v4->metaTypeToJS(types[ii], args[ii + 1]);
 }
 
+void QV4::warnAboutCoercionToVoid(
+        ExecutionEngine *engine, const Value &value, CoercionProblem problem)
+{
+    auto log = qCritical().nospace().noquote();
+    if (const CppStackFrame *frame = engine->currentStackFrame)
+        log << frame->source() << ':' << frame->lineNumber() << ": ";
+    log << value.toQStringNoThrow()
+        << " should be coerced to void because";
+    switch (problem) {
+    case InsufficientAnnotation:
+        log << " the function called is insufficiently annotated.";
+        break;
+    case InvalidListType:
+        log << " the target type, a list of unknown elements, cannot be resolved.";
+        break;
+    }
+
+    log << " The original value is retained. This will change in a future version of Qt.";
+}
+
+
 QT_END_NAMESPACE