From 8da50c907754d9af1dc4532938d7d72f34ec96bf Mon Sep 17 00:00:00 2001
From: Jonas Schievink <jonasschievink@gmail.com>
Date: Fri, 5 Mar 2021 14:06:09 +0100
Subject: Change `ChildBySource` to allow reusing `DynMap`

---
 crates/hir_def/src/generics.rs | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

(limited to 'crates/hir_def/src/generics.rs')

diff --git a/crates/hir_def/src/generics.rs b/crates/hir_def/src/generics.rs
index 3ace3be1f..a056ab797 100644
--- a/crates/hir_def/src/generics.rs
+++ b/crates/hir_def/src/generics.rs
@@ -421,8 +421,7 @@ impl HasChildSource<LocalConstParamId> for GenericDefId {
 }
 
 impl ChildBySource for GenericDefId {
-    fn child_by_source(&self, db: &dyn DefDatabase) -> DynMap {
-        let mut res = DynMap::default();
+    fn child_by_source_to(&self, db: &dyn DefDatabase, res: &mut DynMap) {
         let (_, sm) = GenericParams::new(db, *self);
 
         let sm = sm.as_ref();
@@ -440,6 +439,5 @@ impl ChildBySource for GenericDefId {
             let id = ConstParamId { parent: *self, local_id };
             res[keys::CONST_PARAM].insert(sm.with_value(src.clone()), id);
         }
-        res
     }
 }
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