Currently only supports basic usage, not full usage with lru and config.
I saw the new macro_attr attribute and wanted to try it out (alongside macro_metavar_expr_concat), so I found a proc_macro crate that seemed simple enough and rewrote it based on its documentation.
I hope this serves as a good proof-of-concept of what will hopefully be possible in stable rust in the future, and potentially inspire other people to mess around with macro_rules!.
Can you explain this ? How does it work?
It works like memoize, except defined using macro_rules!. see that crate's docs for info, and see the tests/ directory for usage examples for memoize-decl.
memoize is using #[proc_macro_attribute] It even more complex. 
. Sr. Can you tell me the principal behind your macro ?
the original crate is more complex because it supports additional configuration.
the idea of the macro is that it caches the output of a pure function so repeated calls don't require recomputation.
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