Moisture is a Rust syntax parsing library intended for use with procedural macros. It is based on syn, quote and proc-macro2. It's primary function is to crawl the syntax tree provided by the syn, process the individual items provided via registered callbacks handling the items, then return the token stream to the given objects. Moisture is intended to be a procedural macro solution for complex handling of the Rust syntax tree.
The changelog can be found here and further documentation can be found here.