• I put the types first in the file, sorted by importance
• then the public free functions
• then the impl blocks, sorted by importance, also. Usually, display impls and similar end up being at the end
• then the private free functions (helpers)

The idea is that I can see all the types in one glance, then I look at the rest.

It’s a toy example. In that case, the solution is to assign the expression to a variable to compute its result upfront.

There are still obvious things the BC cannot get. For example:

struct Foo;

impl Foo {
    fn num(&mut self) -> usize { 0 }
    fn index(&mut self, _i: usize) { }
}

let foo = Foo;
foo.index(foo.num()); //error

I really like this instance, so of course I’m 100% for the move