Properly handle different defaults for severity of lints

Previously all lints were assumed to be `#[warn]`, and we had a hand-coded list of `#[allow]` exceptions. Now the severity is autogenerated from rustdoc output.

Also support lints that change status between editions, and the `warnings` lint group.

3 files changed, 4 insertions, 79 deletions

diff --git a/src/tools/rust-analyzer/crates/parser/Cargo.toml b/src/tools/rust-analyzer/crates/parser/Cargo.toml
index d5255665b46..3629d275c0c 100644
--- a/src/tools/rust-analyzer/crates/parser/Cargo.toml
+++ b/src/tools/rust-analyzer/crates/parser/Cargo.toml
@@ -18,6 +18,8 @@ ra-ap-rustc_lexer.workspace = true
 limit.workspace = true
 tracing = { workspace = true, optional = true }
 
+edition.workspace = true
+
 [dev-dependencies]
 expect-test = "1.4.0"
 
diff --git a/src/tools/rust-analyzer/crates/parser/src/edition.rs b/src/tools/rust-analyzer/crates/parser/src/edition.rs
deleted file mode 100644
index 702b16252d4..00000000000
--- a/src/tools/rust-analyzer/crates/parser/src/edition.rs
+++ /dev/null
@@ -1,77 +0,0 @@
-//! The edition of the Rust language used in a crate.
-// Ideally this would be defined in the span crate, but the dependency chain is all over the place
-// wrt to span, parser and syntax.
-use std::fmt;
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
-#[repr(u8)]
-pub enum Edition {
-    Edition2015,
-    Edition2018,
-    Edition2021,
-    Edition2024,
-}
-
-impl Edition {
-    pub const DEFAULT: Edition = Edition::Edition2015;
-    pub const LATEST: Edition = Edition::Edition2024;
-    pub const CURRENT: Edition = Edition::Edition2021;
-    /// The current latest stable edition, note this is usually not the right choice in code.
-    pub const CURRENT_FIXME: Edition = Edition::Edition2021;
-
-    pub fn at_least_2024(self) -> bool {
-        self >= Edition::Edition2024
-    }
-
-    pub fn at_least_2021(self) -> bool {
-        self >= Edition::Edition2021
-    }
-
-    pub fn at_least_2018(self) -> bool {
-        self >= Edition::Edition2018
-    }
-
-    pub fn iter() -> impl Iterator<Item = Edition> {
-        [Edition::Edition2015, Edition::Edition2018, Edition::Edition2021, Edition::Edition2024]
-            .iter()
-            .copied()
-    }
-}
-
-#[derive(Debug)]
-pub struct ParseEditionError {
-    invalid_input: String,
-}
-
-impl std::error::Error for ParseEditionError {}
-impl fmt::Display for ParseEditionError {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "invalid edition: {:?}", self.invalid_input)
-    }
-}
-
-impl std::str::FromStr for Edition {
-    type Err = ParseEditionError;
-
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        let res = match s {
-            "2015" => Edition::Edition2015,
-            "2018" => Edition::Edition2018,
-            "2021" => Edition::Edition2021,
-            "2024" => Edition::Edition2024,
-            _ => return Err(ParseEditionError { invalid_input: s.to_owned() }),
-        };
-        Ok(res)
-    }
-}
-
-impl fmt::Display for Edition {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.write_str(match self {
-            Edition::Edition2015 => "2015",
-            Edition::Edition2018 => "2018",
-            Edition::Edition2021 => "2021",
-            Edition::Edition2024 => "2024",
-        })
-    }
-}
diff --git a/src/tools/rust-analyzer/crates/parser/src/lib.rs b/src/tools/rust-analyzer/crates/parser/src/lib.rs
index 679492066a3..e461492cc6f 100644
--- a/src/tools/rust-analyzer/crates/parser/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/parser/src/lib.rs
@@ -25,7 +25,6 @@ extern crate ra_ap_rustc_lexer as rustc_lexer;
 #[cfg(feature = "in-rust-tree")]
 extern crate rustc_lexer;
 
-mod edition;
 mod event;
 mod grammar;
 mod input;
@@ -41,8 +40,9 @@ mod tests;
 
 pub(crate) use token_set::TokenSet;
 
+pub use edition::Edition;
+
 pub use crate::{
-    edition::Edition,
     input::Input,
     lexed_str::LexedStr,
     output::{Output, Step},