rubinius/rubinius — pull request #2021 by kachick (2012-11-16 15:14:55+00:00)
Title: Modify visibility of Struct#_attrs, "public" to "private"

I guess, Struct#_attrs is a private method.
Because directly accessing inner data structures.

[some discussions](https://github.com/kachick/rubinius/pull/3)