mozilla/rust — pull request #8830 by andersk (2013-08-28 22:11:06+00:00)
Title: rust-mode: Default rust-indent-offset to 4, not default-tab-width

`default-tab-width` is standardly 8, but most programmers and style guides prefer an indentation width smaller than that. Rust itself uses 4 space indents. Most other Emacs modes define the indentation width as 4 or 2 spaces, independently of the width of a Tab character. Depending on `default-tab-width` makes especially little sense for rust-mode because it sets `indent-tabs-mode` to `nil`.