exhaustive /ɪɡˈzɔːstɪv,ɛɡˈzɔːstɪv/ - including or considering all elements or aspects; fully comprehensive.

This crate was born from issue #23 in dtolnay/proc_macro_workshop.

I'd like to see a basic implementation of a macro for Python-style list and map comprehensions, and decide whether it would be a better teaching example for function-like proc macros than the current seq! project.

Something like:

let squares_map = c![n => n*n for n in 0..100 if n % 5 != 0];

There are some crates which implement this functionality or really similar, however, most of the crates are implemented using macro_rules!.

Captain Obvious: Which is not a procedural macro and thus not adequate as a learning example of such.

The existing crates are:

• cute - Macro for Python-esque list comprehensions in Rust.
• mapcomp - Python-like list comprehension via macros for some standard containers.
• iter-comprehensions - A library for iterator comprehensions.
• comprehension - Iterator comprehension in Rust.

The last one, comprehension, is the only one implemented using function-like procedural macros, however the syntax is based on Haskell, not Python.