Commits on Dec 13, 2019

1. std: Implement LineWriter::write_vectored …

   This commit implements the `write_vectored` method of the `LineWriter`
   type. First discovered in bytecodealliance/wasmtime#629 the
   `write_vectored` method of `Stdout` bottoms out here but only ends up
   writing the first buffer due to the default implementation of
   `write_vectored`.
   
   Like `BufWriter`, however, `LineWriter` can have a non-default
   implementation of `write_vectored` which tries to preserve the
   vectored-ness as much as possible. Namely we can have a vectored write
   for everything before the newline and everything after the newline if
   all the stars align well.
   
   Also like `BufWriter`, though, special care is taken to ensure that
   whenever bytes are written we're sure to signal success since that
   represents a "commit" of writing bytes.

   

   alexcrichton committed Dec 13, 2019
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