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The type [Type] is represented by its constructor function in the runtime type system, and if it used as a type argument, we install a $isType-tag on it for subtype checks. R=floitsch@google.com Review URL: https://codereview.chromium.org//556833004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@40045 260f80e4-7a28-3924-810f-c04153c831b5