db4653f0e0
This change adds a check that reports duplicate initialization of instance fields. Fixes issues 921 and 1034. There were several tests in the language suite that had duplicate initializers for final instance fields. Corrected the tests. dart2js also contained duplicate initializations of a couple of final fields. Review URL: https://chromiumcodereview.appspot.com//10825140 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@10146 260f80e4-7a28-3924-810f-c04153c831b5