This plugin is provided as-is with no guarantees of any kind.
Syntax highlighting isn't great, but setting breakpoints in the GUI should work.
Based on: https://github.com/youknowone/rust-xcode-langspec https://github.com/steventroughtonsmith/lua-xclangspec
Place the Plug-ins and Specifications folders in ~Library/Developer/Xcode
Plug-ins
Specifications
~Library/Developer/Xcode