Function path_call_target 

pub fn path_call_target(
    path: &[SmolStr],
    type_args: &[TypeExpr],
    span: Span,
    ctx: Ctx,
    state: &mut State<'_>,
) -> Option<usize>

The impl function a call written by its path names.

Point::origin(), Set<int>::new() and shapes::Point::origin() are such calls: path is a struct or an enum followed by the name of a function its impl block declares, and the answer is that function’s id. None leaves the path to the other lookups: a variant of the enum, a module function, a generic function.

A function declared with no parameters is the only one a path reaches. One that declares a receiver is a method, and a path call to it is reported here with the dot call it needs.