I am using Mindscape Web Workbench (pro) to generate some CSS from a LESS file. I have two mixins with the same name but a different number of arguments. According to the LESS docs the correct mixin should be automatically selected based on the number of arguments in the call. Here is the relevant section from the docs: We can also match on arity, here’s an example: .mixin (@a) { color: @a; } .mix