fixed a merge-caused error

crates/hir-def/src/generics.rs

@@ -307,7 +307,7 @@ impl GenericParams {
                     let param = ConstParamData {
                         name,
                         ty: Interned::new(ty),
-                        default: ConstRef::from_const_param(lower_ctx, const_param),
+                        default: ConstRef::from_const_param(lower_ctx, &const_param),
                     };
                     let idx = self.type_or_consts.alloc(param.into());
                     add_param_attrs(idx.into(), ast::GenericParam::ConstParam(const_param));

crates/hir-def/src/hir/type_ref.rs

@@ -395,7 +395,7 @@ impl ConstRef {
 
     pub(crate) fn from_const_param(
         lower_ctx: &LowerCtx<'_>,
-        param: ast::ConstParam,
+        param: &ast::ConstParam,
     ) -> Option<Self> {
         let default = param.default_val();
         match default {