First remarks on code

[pbougue]

@TeXitoi To be discussed, as there's no PR to discuss on.

• https://github.com/CanalTP/navitia_model/blob/9327364e29645194cb79866609131e657dff2be8/src/lib.rs#L79
  I'd name it Context more than PtObjects

• https://github.com/CanalTP/navitia_model/blob/9327364e29645194cb79866609131e657dff2be8/src/lib.rs#L10
  :) not able to read or maintain that... We have to take a course on that! Maybe clearer (longer) macro param names (what is ty for?)?

• https://github.com/CanalTP/navitia_model/blob/09d7b0d4913b8df7469977c7fa0d4e8baf5b60e5/get-corresponding-derive/src/lib.rs#L12
  Again the naming is not super helping, or missing comments (also the case for get-corresponding-derive/src/lib.rs in general)?

[TeXitoi]

1. As you wish, it was named like that when the crate was named pt_objects.
2. Funny, I removed this macro this morning before reading this issue d90366c
3. https://doc.rust-lang.org/book/first-edition/procedural-macros.html (ast if for Abstract Syntax Tree).