Use `dyn Trait` for working with databse

It improves compile time in `--release` mode quite a bit, it doesn't
really slow things down and, conceptually, it seems closer to what we
want the physical architecture to look like (we don't want to
monomorphise EVERYTHING in a single leaf crate).

1 files changed, 1 insertions, 1 deletions

diff --git a/crates/ra_hir_def/src/body/scope.rs b/crates/ra_hir_def/src/body/scope.rs
index a58a7b21f..7c3db8869 100644
--- a/crates/ra_hir_def/src/body/scope.rs
+++ b/crates/ra_hir_def/src/body/scope.rs
@@ -45,7 +45,7 @@ pub struct ScopeData {
 }
 
 impl ExprScopes {
-    pub(crate) fn expr_scopes_query(db: &impl DefDatabase, def: DefWithBodyId) -> Arc<ExprScopes> {
+    pub(crate) fn expr_scopes_query(db: &dyn DefDatabase, def: DefWithBodyId) -> Arc<ExprScopes> {
         let body = db.body(def);
         Arc::new(ExprScopes::new(&*body))
     }