Revert "Bump dashmap"

This reverts commit 485f318.

Author: lnicola

Cargo.lock

@@ -11,9 +11,7 @@ doctest = false
 
 [dependencies]
 cov-mark = "2.0.0-pre.1"
-dashmap = { version = "5.0", features = ["raw-api"] }
-lock_api = "0.4"
-parking_lot = "0.11"
+dashmap = { version = "4.0.2", features = ["raw-api"] }
 tracing = "0.1"
 once_cell = "1.3.1"
 rustc-hash = "1.1.0"

crates/hir_def/Cargo.toml

@@ -10,20 +10,15 @@ use std::{
     sync::Arc,
 };
 
-use dashmap::{DashMap, SharedValue};
-use lock_api::RwLockWriteGuard;
+use dashmap::{lock::RwLockWriteGuard, DashMap, SharedValue};
 use once_cell::sync::OnceCell;
-use parking_lot::RawRwLock;
 use rustc_hash::FxHasher;
 
 use crate::generics::GenericParams;
 
 type InternMap<T> = DashMap<Arc<T>, (), BuildHasherDefault<FxHasher>>;
-type Guard<T> = RwLockWriteGuard<
-    'static,
-    RawRwLock,
-    HashMap<Arc<T>, SharedValue<()>, BuildHasherDefault<FxHasher>>,
->;
+type Guard<T> =
+    RwLockWriteGuard<'static, HashMap<Arc<T>, SharedValue<()>, BuildHasherDefault<FxHasher>>>;
 
 pub struct Interned<T: Internable + ?Sized> {
     arc: Arc<T>,