ditsing/ruaft @ e16cb2f9ec0fe81fd2b383fe3d08b8dea208e013

Jing Yang e16cb2f9ec Add a comment to explain what put_append returns.		%!s(int64=4) %!d(string=hai) anos
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src	e16cb2f9ec Add a comment to explain what put_append returns.	%!s(int64=4) %!d(string=hai) anos
tests	f93a1fa8f7 Add two lineariability tests.	%!s(int64=4) %!d(string=hai) anos
Cargo.toml	fc6fa38733 Remove scopeguard from dependencies.	%!s(int64=4) %!d(string=hai) anos