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1. Number of required parameters. 2. Names and order of named parameters. 3. [disabled] type warning for non-identical types. 4. [wait for Eric, not implemented] type parameters check. R=zundel@google.com BUG= TEST= Review URL: http://codereview.chromium.org//8786002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@2124 260f80e4-7a28-3924-810f-c04153c831b5