clippy_lints: Replace lazy_static with SyncLazy

clippy_lints/Cargo.toml

@@ -20,7 +20,6 @@ edition = "2018"
 cargo_metadata = "0.11.1"
 if_chain = "1.0.0"
 itertools = "0.9"
-lazy_static = "1.0.2"
 pulldown-cmark = { version = "0.8", default-features = false }
 quine-mc_cluskey = "0.2.2"
 regex-syntax = "0.6"

clippy_lints/src/lib.rs

@@ -7,6 +7,7 @@
 #![feature(crate_visibility_modifier)]
 #![feature(drain_filter)]
 #![feature(in_band_lifetimes)]
+#![feature(once_cell)]
 #![feature(or_patterns)]
 #![feature(rustc_private)]
 #![feature(stmt_expr_attributes)]

clippy_lints/src/macro_use.rs

@@ -18,9 +18,9 @@ declare_clippy_lint! {
     /// **Known problems:** None.
     ///
     /// **Example:**
-    /// ```rust
+    /// ```rust,ignore
     /// #[macro_use]
-    /// use lazy_static;
+    /// use some_macro;
     /// ```
     pub MACRO_USE_IMPORTS,
     pedantic,

clippy_lints/src/utils/conf.rs

@@ -2,10 +2,10 @@
 
 #![deny(clippy::missing_docs_in_private_items)]
 
-use lazy_static::lazy_static;
 use rustc_ast::ast::{LitKind, MetaItemKind, NestedMetaItem};
 use rustc_span::source_map;
 use source_map::Span;
+use std::lazy::SyncLazy;
 use std::path::{Path, PathBuf};
 use std::sync::Mutex;
 use std::{env, fmt, fs, io};
@@ -54,9 +54,8 @@ impl From<io::Error> for Error {
     }
 }
 
-lazy_static! {
-    static ref ERRORS: Mutex<Vec<Error>> = Mutex::new(Vec::new());
-}
+/// Vec of errors that might be collected during config toml parsing
+static ERRORS: SyncLazy<Mutex<Vec<Error>>> = SyncLazy::new(|| Mutex::new(Vec::new()));
 
 macro_rules! define_Conf {
     ($(#[$doc:meta] ($config:ident, $config_str:literal: $Ty:ty, $default:expr),)+) => {
@@ -82,6 +81,7 @@ macro_rules! define_Conf {
                     use serde::Deserialize;
                     pub fn deserialize<'de, D: serde::Deserializer<'de>>(deserializer: D) -> Result<$Ty, D::Error> {
                         use super::super::{ERRORS, Error};
+
                         Ok(
                             <$Ty>::deserialize(deserializer).unwrap_or_else(|e| {
                                 ERRORS