use crate::symbol::{sym, Symbol}; use std::fmt; use std::str::FromStr; use rustc_macros::HashStable_Generic; /// The edition of the compiler (RFC 2052) #[derive(Clone, Copy, Hash, PartialEq, PartialOrd, Debug, RustcEncodable, RustcDecodable, Eq)] #[derive(HashStable_Generic)] pub enum Edition { // editions must be kept in order, oldest to newest /// The 2015 edition Edition2015, /// The 2018 edition Edition2018, // when adding new editions, be sure to update: // // - Update the `ALL_EDITIONS` const // - Update the EDITION_NAME_LIST const // - add a `rust_####()` function to the session // - update the enum in Cargo's sources as well } // must be in order from oldest to newest pub const ALL_EDITIONS: &[Edition] = &[Edition::Edition2015, Edition::Edition2018]; pub const EDITION_NAME_LIST: &str = "2015|2018"; pub const DEFAULT_EDITION: Edition = Edition::Edition2015; impl fmt::Display for Edition { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { let s = match *self { Edition::Edition2015 => "2015", Edition::Edition2018 => "2018", }; write!(f, "{}", s) } } impl Edition { pub fn lint_name(&self) -> &'static str { match *self { Edition::Edition2015 => "rust_2015_compatibility", Edition::Edition2018 => "rust_2018_compatibility", } } pub fn feature_name(&self) -> Symbol { match *self { Edition::Edition2015 => sym::rust_2015_preview, Edition::Edition2018 => sym::rust_2018_preview, } } pub fn is_stable(&self) -> bool { match *self { Edition::Edition2015 => true, Edition::Edition2018 => true, } } } impl FromStr for Edition { type Err = (); fn from_str(s: &str) -> Result { match s { "2015" => Ok(Edition::Edition2015), "2018" => Ok(Edition::Edition2018), _ => Err(()), } } }