fix warnings

Author: davidbarsky

crates/hir-def/src/lib.rs

@@ -63,10 +63,7 @@ mod pretty;
 #[cfg(test)]
 mod test_db;
 
-use std::{
-    hash::{Hash, Hasher},
-    panic::{RefUnwindSafe, UnwindSafe},
-};
+use std::hash::{Hash, Hasher};
 
 use base_db::{impl_intern_key, CrateId};
 use hir_expand::{

crates/hir/src/symbols.rs

@@ -353,7 +353,7 @@ impl<'a> SymbolCollector<'a> {
         }
     }
 
-    fn push_decl<'db, L>(&mut self, id: L, name: &Name, is_assoc: bool)
+    fn push_decl<L>(&mut self, id: L, name: &Name, is_assoc: bool)
     where
         L: Lookup<Database = dyn DefDatabase> + Into<ModuleDefId>,
         <L as Lookup>::Data: HasSource,

crates/ide-db/src/traits.rs

@@ -1,10 +1,6 @@
 //! Functionality for obtaining data related to traits from the DB.
 
-use crate::{
-    base_db::{salsa::AsDynDatabase, RootQueryDb},
-    defs::Definition,
-    RootDatabase,
-};
+use crate::{defs::Definition, RootDatabase};
 use hir::{db::HirDatabase, AsAssocItem, Semantics};
 use rustc_hash::FxHashSet;
 use syntax::{ast, AstNode};