Merge pull request #7733 from edolstra/clang-c++20

Fix C++20 compilation with clang

src/libexpr/flake/lockfile.cc

@@ -219,7 +219,7 @@ std::optional<FlakeRef> LockFile::isUnlocked() const
     visit(root);
 
     for (auto & i : nodes) {
-        if (i == root) continue;
+        if (i == ref<const Node>(root)) continue;
         auto node = i.dynamic_pointer_cast<const LockedNode>();
         if (node && !node->lockedRef.input.isLocked())
             return node->lockedRef;

src/libstore/store-api.cc

@@ -744,7 +744,7 @@ StorePathSet Store::queryValidPaths(const StorePathSet & paths, SubstituteFlag m
 
     auto doQuery = [&](const StorePath & path) {
         checkInterrupt();
-        queryPathInfo(path, {[path, this, &state_, &wakeup](std::future<ref<const ValidPathInfo>> fut) {
+        queryPathInfo(path, {[path, &state_, &wakeup](std::future<ref<const ValidPathInfo>> fut) {
             auto state(state_.lock());
             try {
                 auto info = fut.get();