Commits on Nov 28, 2016

1. std: Fix partial writes in LineWriter …

   Previously the `LineWriter` could successfully write some bytes but then fail to
   report that it has done so. Additionally, an erroneous flush after a successful
   write was permanently ignored. This commit fixes these two issues by (a)
   maintaining a `need_flush` flag to indicate whether a flush should be the first
   operation in `LineWriter::write` and (b) avoiding returning an error once some
   bytes have been successfully written.
   
   Closes rust-lang#37807

   

   alexcrichton committed Nov 28, 2016
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