Merge changes Id0e651e4,I0ed20da8,I76bd6d22,I5d8ffb7b into main

* changes:
  store: fix null reference from DerivationGoal::waiteeDone
  libmain: fix UB in verbosity assignment
  build: make UBSan work :)
  libexpr: fix accessing uninitialized values and fix pure-eval docs

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 8d6cdaad7..9bd27e22d 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -418,7 +418,7 @@ EvalState::EvalState(
     }
 
     if (evalSettings.restrictEval || evalSettings.pureEval) {
-        allowedPaths = PathSet();
+        allowedPaths = std::optional(PathSet());
 
         for (auto & i : searchPath.elements) {
             auto r = resolveSearchPathPath(i.path);