Adapted from
proc-macro2Removed wrap proc-macro for correct span outside rust sources Not use in proc-macro context if you don't know what you do
A wrapper around the procedural macro API of the compiler's proc_macro crate.
This library serves two purposes:
Bring proc-macro-like functionality to other contexts like build.rs and
main.rs. Types from proc_macro are entirely specific to procedural macros
and cannot ever exist in code outside of a procedural macro. Meanwhile
proc_macro2 types may exist anywhere including non-macro code. By developing
foundational libraries like [syn] and [quote] against proc_macro2 rather
than proc_macro, the procedural macro ecosystem becomes easily applicable to
many other use cases and we avoid reimplementing non-macro equivalents of
those libraries.
Make procedural macros unit testable. As a consequence of being specific
to procedural macros, nothing that uses proc_macro can be executed from a
unit test. In order for helper libraries or components of a macro to be
testable in isolation, they must be implemented using proc_macro2.
toml
[dependencies]
proc-macro2-impersonated = "1.0"
Licensed under either of Apache License, Version 2.0 or MIT license at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.