scan-rules 0.1.1

This crate provides some macros for quickly parsing values out of text. Roughly speaking, it does the inverse of the print!/format! macros; or, in other words, a similar job to scanf from C.
Documentation 
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/*
Copyright ⓒ 2016 Daniel Keep.

Licensed under the MIT license (see LICENSE or <http://opensource.org
/licenses/MIT>) or the Apache License, Version 2.0 (see LICENSE of
<http://www.apache.org/licenses/LICENSE-2.0>), at your option. All
files in the project carrying such notice may not be copied, modified,
or distributed except according to those terms.
*/
extern crate rustc_version;
use rustc_version::{version_matches};

fn main() {
    println!("cargo:rerun-if-changed=build.rs");

    /*
    See <https://github.com/rust-lang/rust/issues/26448#issuecomment-173794570>.
    */
    if version_matches("< 1.7.0") {
        println!("cargo:rustc-cfg=str_into_output_extra_broken");
    }

    if version_matches("1.4.0") {
        /*
        `AddrParseError` doesn't implement `Error` < 1.4.  It's easier to just not implement the scanners for the `std::net` module than futzing with translating errors differently.
        */
        println!("cargo:rustc-cfg=std_net_scanners");
        println!("cargo:rustc-cfg=binary_heap_impls_debug");
        println!("cargo:rustc-cfg=f64_debug_is_roundtrip_accurate");
    }

    if version_matches("1.5.0") {
        println!("cargo:rustc-cfg=socket_addr_vx_scanners")
    }
}