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ref: e83d16d5bd500b8e1913a836560f943a757ab86b parent: 6121d28dc28103cb85b22fe404daaa8c441790b4 author: Ori Bernstein <ori@eigenstate.org> date: Sat Aug 27 11:55:36 EDT 2016
Rename `std.Fail to `std.Err.