remove Bindings::need

a future commit will remove the ability to convert the symbol type used in
bindings to strings. since we only have two users we can inline the error check.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/nix/bundle.cc b/src/nix/bundle.cc
index 81fb8464a..ee91e8ed0 100644
--- a/src/nix/bundle.cc
+++ b/src/nix/bundle.cc
@@ -110,8 +110,10 @@ struct CmdBundle : InstallableCommand
         auto outPathS = store->printStorePath(outPath);
 
         if (!outLink) {
-            auto &attr = vRes->attrs->need(evalState->sName);
-            outLink = evalState->forceStringNoCtx(*attr.value,*attr.pos);
+            auto * attr = vRes->attrs->get(evalState->sName);
+            if (!attr)
+                throw Error("attribute 'name' missing");
+            outLink = evalState->forceStringNoCtx(*attr->value, *attr->pos);
         }
 
         // TODO: will crash if not a localFSStore?