Saving alternative signature parsing errors to binding trace.

compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/JavaDescriptorResolver.java

@@ -1579,6 +1579,9 @@ public class JavaDescriptorResolver implements DependencyClassByQualifiedNameRes
             returnType = alternativeSignatureData.getReturnType();
             methodTypeParameters = alternativeSignatureData.getTypeParameters();
         }
+        else if (alternativeSignatureData.getError() != null) {
+            trace.record(BindingContext.ALTERNATIVE_SIGNATURE_DATA_ERROR, functionDescriptorImpl, alternativeSignatureData.getError());
+        }
 
         functionDescriptorImpl.initialize(
                 valueParameterDescriptors.receiverType,

compiler/frontend/src/org/jetbrains/jet/lang/resolve/BindingContext.java

@@ -252,6 +252,8 @@ public interface BindingContext {
 
     WritableSlice<ClassDescriptor, Boolean> INCOMPLETE_HIERARCHY = Slices.createCollectiveSetSlice();
 
+    WritableSlice<DeclarationDescriptor, String> ALTERNATIVE_SIGNATURE_DATA_ERROR = Slices.createSimpleSlice();
+
     @SuppressWarnings("UnusedDeclaration")
     @Deprecated // This field is needed only for the side effects of its initializer
             Void _static_initializer = BasicWritableSlice.initSliceDebugNames(BindingContext.class);