Fix deferred load errors / bug #26482

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 13b84c64387f0b86d970b534c259ad4b7ffc2e1a..5d238be72afac6bd1cf0cf0af9938bea1b79417d 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -10901,6 +10901,13 @@ void LibraryPrefix::set_is_loaded() const {
 }
 
 
+bool LibraryPrefix::has_error() const {
+  ASSERT(num_imports() == 1);
+  const Library& deferred_lib = Library::Handle(GetLibrary(0));
+  return deferred_lib.LoadFailed();

[hausner, 2016/06/07 21:47:05]

I'm not sure LoadFailed() is sufficient. You need to check transiently whether
any of the libraries imported by deferred_lib has failed.

+}
+
+
 bool LibraryPrefix::LoadLibrary() const {
   // Non-deferred prefixes are loaded.
   ASSERT(is_deferred_load() || is_loaded());