This Brackets extension needs racer to complete code. After install racer correctly, open the Rust-IDE Settings dialog from File Menu, set the correct racer path.
Get racer here:
https://github.com/phildawes/racer
Lint use rustc -Zno-trans and cargo rustc -Zno-trans, so ensure you have rustc and cargo in your system path.
quick-edit now search function endline based on your rust code indentation, the result maybe inaccurate.