proc-macro2 1.0.103

A substitute implementation of the compiler's `proc_macro` API to decouple token-based libraries from the procedural macro use case.
Documentation 
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// The subset of Span's API stabilized in Rust 1.88.

extern crate proc_macro;

use proc_macro::Span;
use std::path::PathBuf;

pub fn file(this: &Span) -> String {
    this.file()
}

pub fn local_file(this: &Span) -> Option<PathBuf> {
    this.local_file()
}