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auto merge of #18788 : ricky26/rust/master, r=aturon
This moves chars() and lines() out of Buffer and into separate traits (CharsBuffer and LinesBuffer respectively) - this matches the pattern used for bytes() on Reader (with BytesReader).
(I came across this when I wanted a trait object of a Buffer, so that I could use read_line(); rustc errors about std::io::Buffer not being object-safe.)
[breaking-change]
Any uses of Buffer::lines() will need to use the new trait std::io::LinesBuffer.
The same is true for Buffer::chars() with std::io::CharsBuffer.
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