Report internal error when an exported library isn't loaded.

pkg/front_end/lib/src/fasta/fasta_codes_generated.dart

Index: pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
diff --git a/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart b/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
index 5ece41d025f4b9b78eb8cb50a6c34194a48a6a27..85af95d2149eb62db6cba72281fb4510262d973c 100644
--- a/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
+++ b/pkg/front_end/lib/src/fasta/fasta_codes_generated.dart
@@ -1451,6 +1451,32 @@ Message _withArgumentsInternalProblemConstructorNotFound(
       arguments: {'name': name, 'uri': uri_});
 }
 
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Template<Message Function(Uri uri_, Uri uri2_)>
+    templateInternalProblemExportedLibraryNotLoaded =
+    const Template<Message Function(Uri uri_, Uri uri2_)>(
+        messageTemplate:
+            r"""The library '#uri' isn't loaded, but '#uri2' exports it.""",
+        withArguments: _withArgumentsInternalProblemExportedLibraryNotLoaded);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Code<Message Function(Uri uri_, Uri uri2_)>
+    codeInternalProblemExportedLibraryNotLoaded =
+    const Code<Message Function(Uri uri_, Uri uri2_)>(
+  "InternalProblemExportedLibraryNotLoaded",
+  templateInternalProblemExportedLibraryNotLoaded,
+);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+Message _withArgumentsInternalProblemExportedLibraryNotLoaded(
+    Uri uri_, Uri uri2_) {
+  String uri = relativizeUri(uri_);
+  String uri2 = relativizeUri(uri2_);
+  return new Message(codeInternalProblemExportedLibraryNotLoaded,
+      message: """The library '$uri' isn't loaded, but '$uri2' exports it.""",
+      arguments: {'uri': uri_, 'uri2': uri2_});
+}
+
 // DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
 const Code<Null> codeInternalProblemExtendingUnmodifiableScope =
     messageInternalProblemExtendingUnmodifiableScope;