fs-err 3.1.3

A drop-in replacement for std::fs with more helpful error messages.
Documentation 
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extern crate autocfg;

fn main() {
    let ac = autocfg::new();
    ac.emit_rustc_version(1, 63); // #[cfg(rustc_1_63)]
    ac.emit_rustc_version(1, 81); // #[cfg(rustc_1_81)]
    ac.emit_rustc_version(1, 89); // #[cfg(rustc_1_89)]

    // Re-run if this file changes
    autocfg::rerun_path("build.rs");
}