[modules] Improve error messages.

src/ast/scopeinfo.cc

Index: src/ast/scopeinfo.cc
diff --git a/src/ast/scopeinfo.cc b/src/ast/scopeinfo.cc
index cf58e44c5bc8ae3b28dc2bb0377d6caf9f4a4d07..c4e43077afd4813f5e734b8fdfa4a2945e05874b 100644
--- a/src/ast/scopeinfo.cc
+++ b/src/ast/scopeinfo.cc
@@ -867,12 +867,15 @@ Handle<ModuleInfoEntry> ModuleInfoEntry::New(Isolate* isolate,
                                              Handle<Object> export_name,
                                              Handle<Object> local_name,
                                              Handle<Object> import_name,
-                                             Handle<Object> module_request) {
+                                             Handle<Object> module_request,
+                                             int beg_pos, int end_pos) {
   Handle<ModuleInfoEntry> result = isolate->factory()->NewModuleInfoEntry();
   result->set(kExportNameIndex, *export_name);
   result->set(kLocalNameIndex, *local_name);
   result->set(kImportNameIndex, *import_name);
   result->set(kModuleRequestIndex, *module_request);
+  result->set(kBegPosIndex, Smi::FromInt(beg_pos));
+  result->set(kEndPosIndex, Smi::FromInt(end_pos));
   return result;
 }