// SPDX-License-Identifier: Apache-2.0 OR MIT // This code exercises the surface area that we expect of Span's unstable API.// If the current toolchain is able to compile it, then proc-macro2 is able to// offer these APIs too. #![cfg_attr(procmacro2_build_probe, feature(proc_macro_span))] extern crate proc_macro; use core::ops::{Range, RangeBounds};use proc_macro::{Literal, Span};use std::path::PathBuf; pub fn byte_range(this: &Span) -> Range<usize> {    this.byte_range()} pub fn start(this: &Span) -> Span {    this.start()} pub fn end(this: &Span) -> Span {    this.end()} pub fn line(this: &Span) -> usize {    this.line()} pub fn column(this: &Span) -> usize {    this.column()} pub fn file(this: &Span) -> String {    this.file()} pub fn local_file(this: &Span) -> Option<PathBuf> {    this.local_file()} pub fn join(this: &Span, other: Span) -> Option<Span> {    this.join(other)} pub fn subspan<R: RangeBounds<usize>>(this: &Literal, range: R) -> Option<Span> {    this.subspan(range)} // Include in sccache cache key.#[cfg(procmacro2_build_probe)]const _: Option<&str> = option_env!("RUSTC_BOOTSTRAP");