Little utility to parse a Rust source file into a syn::File and print out a debug representation of the syntax tree.

A complete working implementation of a custom derive. Works on any Rust compiler 1.15+.

An example of parsing a custom syntax within a functionlike!(...) procedural macro. Demonstrates how to trigger custom warnings and error messages on individual tokens of the input.

An attribute procedural macro that uses a syntax tree traversal to transform certain syntax tree nodes in a function body.