diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/expression/FunctionTranslator.java b/js/js.translator/src/org/jetbrains/k2js/translate/expression/FunctionTranslator.java
index e41d11fac5d..2e68a7ed488 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/expression/FunctionTranslator.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/expression/FunctionTranslator.java
@@ -22,15 +22,18 @@ import com.google.dart.compiler.util.AstUtil;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.lang.descriptors.*;
+import org.jetbrains.jet.lang.diagnostics.DiagnosticUtils;
 import org.jetbrains.jet.lang.psi.JetDeclarationWithBody;
 import org.jetbrains.jet.lang.psi.JetElement;
 import org.jetbrains.jet.lang.psi.JetExpression;
 import org.jetbrains.jet.lang.psi.JetFunctionLiteralExpression;
+import org.jetbrains.jet.lang.resolve.BindingContextUtils;
 import org.jetbrains.k2js.translate.context.Namer;
 import org.jetbrains.k2js.translate.context.TemporaryVariable;
 import org.jetbrains.k2js.translate.context.TranslationContext;
 import org.jetbrains.k2js.translate.general.AbstractTranslator;
 import org.jetbrains.k2js.translate.reference.ReferenceTranslator;
+import org.jetbrains.k2js.translate.utils.BindingUtils;
 import org.jetbrains.k2js.translate.utils.JsDescriptorUtils;
 import org.jetbrains.k2js.translate.utils.TranslationUtils;
 import org.jetbrains.k2js.translate.utils.closure.ClosureContext;
@@ -78,7 +81,7 @@ public final class FunctionTranslator extends AbstractTranslator {
         this.descriptor = getFunctionDescriptor(context.bindingContext(), functionDeclaration);
         this.functionDeclaration = functionDeclaration;
         this.functionObject = context().getFunctionObject(descriptor);
-        assert this.functionObject.getParameters().isEmpty();
+        assert this.functionObject.getParameters().isEmpty() : DiagnosticUtils.atLocation(BindingContextUtils.descriptorToDeclaration(context.bindingContext(), descriptor));
         this.functionBody = functionObject.getBody();
         //NOTE: it's important we compute the context before we start the computation
         this.functionBodyContext = getFunctionBodyContext();