1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69
// Copyright 2018 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your // option. This file may not be copied, modified, or distributed // except according to those terms. use std::fmt; use std::str::FromStr; /// The epoch of the compiler (RFC 2052) #[derive(Clone, Copy, Hash, PartialOrd, Ord, Eq, PartialEq, Debug)] #[non_exhaustive] pub enum Epoch { // epochs must be kept in order, newest to oldest /// The 2015 epoch Epoch2015, /// The 2018 epoch Epoch2018, // when adding new epochs, be sure to update: // // - the list in the `parse_epoch` static in librustc::session::config // - add a `rust_####()` function to the session // - update the enum in Cargo's sources as well // // When -Zepoch becomes --epoch, there will // also be a check for the epoch being nightly-only // somewhere. That will need to be updated // whenever we're stabilizing/introducing a new epoch // as well as changing the default Cargo template. } // must be in order from oldest to newest pub const ALL_EPOCHS: &[Epoch] = &[Epoch::Epoch2015, Epoch::Epoch2018]; impl fmt::Display for Epoch { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { let s = match *self { Epoch::Epoch2015 => "2015", Epoch::Epoch2018 => "2018", }; write!(f, "{}", s) } } impl Epoch { pub fn lint_name(&self) -> &'static str { match *self { Epoch::Epoch2015 => "epoch_2015", Epoch::Epoch2018 => "epoch_2018", } } } impl FromStr for Epoch { type Err = (); fn from_str(s: &str) -> Result<Self, ()> { match s { "2015" => Ok(Epoch::Epoch2015), "2018" => Ok(Epoch::Epoch2018), _ => Err(()) } } }