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This empty vector was added in https://codereview.chromium.org/2818273002/ to properly instantiate generic signatures. Later on, the implementation of HasInstantiatedSignature() was improved in https://codereview.chromium.org/2965743002/ making the empty vector unnecessary. However, the implementation of InstantiateFrom() will also need improvement as noted by the added TODO. Change-Id: I042a57b643390c789620b04122084db19ec445ea Reviewed-on: https://dart-review.googlesource.com/13400 Reviewed-by: Siva Annamalai <asiva@google.com> Commit-Queue: Régis Crelier <regis@google.com>