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I ran the gdb.rust tests against Rust 1.20 (beta) and saw a few failures. The failures all came because a particular item moved to a different module. Since the particular choice of module name isn't important here, I simply widened the allowable results. Tested locally against rustc 1.19, 1.20, and 1.21. testsuite/ChangeLog 2017-08-05 Tom Tromey <tom@tromey.com> * gdb.rust/simple.exp: Allow String to appear in a different namespace.