Version checks are useless now that we ride the trains

Author: oli-obk

Cargo.toml

@@ -59,9 +59,5 @@ derive-new = "0.5"
 # for more information.
 rustc-workspace-hack = "1.0.0"
 
-[build-dependencies]
-rustc_version = "0.2.2"
-ansi_term = "0.11"
-
 [features]
 debugging = []

build.rs

@@ -13,98 +13,11 @@
 //! This build script was originally taken from the Rocket web framework:
 //! https://github.com/SergioBenitez/Rocket
 
-use ansi_term::Colour::Red;
-use rustc_version::{version_meta, version_meta_for, Channel, Version, VersionMeta};
 use std::env;
 
 fn main() {
-    check_rustc_version();
-
     // Forward the profile to the main compilation
     println!("cargo:rustc-env=PROFILE={}", env::var("PROFILE").unwrap());
     // Don't rebuild even if nothing changed
     println!("cargo:rerun-if-changed=build.rs");
 }
-
-fn check_rustc_version() {
-    let string = include_str!("min_version.txt");
-    let min_version_meta = version_meta_for(string).expect("Could not parse version string in min_version.txt");
-    let current_version_meta = version_meta().expect("Could not retrieve current rustc version information from ENV");
-
-    let min_version = min_version_meta.clone().semver;
-    let min_date_str = min_version_meta
-        .clone()
-        .commit_date
-        .expect("min_version.txt does not contain a rustc commit date");
-
-    // Dev channel (rustc built from git) does not have any date or commit information in rustc -vV
-    // `current_version_meta.commit_date` would crash, so we return early here.
-    if current_version_meta.channel == Channel::Dev {
-        return;
-    }
-
-    let current_version = current_version_meta.clone().semver;
-    let current_date_str = current_version_meta
-        .clone()
-        .commit_date
-        .expect("current rustc version information does not contain a rustc commit date");
-
-    let print_version_err = |version: &Version, date: &str| {
-        eprintln!(
-            "> {} {}. {} {}.\n",
-            "Installed rustc version is:",
-            format!("{} ({})", version, date),
-            "Minimum required rustc version:",
-            format!("{} ({})", min_version, min_date_str)
-        );
-    };
-
-    if !correct_channel(&current_version_meta) {
-        eprintln!(
-            "\n{} {}",
-            Red.bold().paint("error:"),
-            "Clippy requires a nightly version of Rust."
-        );
-        print_version_err(&current_version, &*current_date_str);
-        eprintln!(
-            "{}{}{}",
-            "See the README (", "https://github.com/rust-lang-nursery/rust-clippy#usage", ") for more information."
-        );
-        panic!("Aborting compilation due to incompatible compiler.")
-    }
-
-    let current_date = str_to_ymd(&current_date_str).unwrap();
-    let min_date = str_to_ymd(&min_date_str).unwrap();
-
-    if current_date < min_date {
-        eprintln!(
-            "\n{} {}",
-            Red.bold().paint("error:"),
-            "Clippy does not support this version of rustc nightly."
-        );
-        eprintln!(
-            "> {}{}{}",
-            "Use `", "rustup update", "` or your preferred method to update Rust."
-        );
-        print_version_err(&current_version, &*current_date_str);
-        panic!("Aborting compilation due to incompatible compiler.")
-    }
-}
-
-fn correct_channel(version_meta: &VersionMeta) -> bool {
-    match version_meta.channel {
-        Channel::Stable | Channel::Beta => false,
-        Channel::Nightly | Channel::Dev => true,
-    }
-}
-
-/// Convert a string of %Y-%m-%d to a single u32 maintaining ordering.
-fn str_to_ymd(ymd: &str) -> Option<u32> {
-    let ymd: Vec<u32> = ymd.split("-").filter_map(|s| s.parse::<u32>().ok()).collect();
-    if ymd.len() != 3 {
-        return None;
-    }
-
-    let (y, m, d) = (ymd[0], ymd[1], ymd[2]);
-    Some((y << 9) | (m << 5) | d)
-}