4 files changed, 17 insertions, 6 deletions

diff --git a/src/nix/flake.cc b/src/nix/flake.cc
index 144f8f886..47a380238 100644
--- a/src/nix/flake.cc
+++ b/src/nix/flake.cc
@@ -706,9 +706,14 @@ struct CmdFlakeInitCommon : virtual Args, EvalCommand
 
         auto [cursor, attrPath] = installable.getCursor(*evalState);
 
-        auto templateDir = cursor->getAttr("path")->getString();
-
-        assert(store->isInStore(templateDir));
+        auto templateDirAttr = cursor->getAttr("path");
+        auto templateDir = templateDirAttr->getString();
+
+        if (!store->isInStore(templateDir))
+            throw TypeError(
+                "'%s' was not found in the Nix store\n"
+                "If you've set '%s' to a string, try using a path instead.",
+                templateDir, templateDirAttr->getAttrPathStr());
 
         std::vector<Path> files;
 
diff --git a/src/nix/repl.cc b/src/nix/repl.cc
index 5c0d44c68..3a51a13e6 100644
--- a/src/nix/repl.cc
+++ b/src/nix/repl.cc
@@ -800,7 +800,7 @@ std::ostream & NixRepl::printValue(std::ostream & str, Value & v, unsigned int m
                 else
                     printStringValue(str, i.first.c_str());
                 str << " = ";
-                if (seen.find(i.second) != seen.end())
+                if (seen.count(i.second))
                     str << "«repeated»";
                 else
                     try {
diff --git a/src/nix/store-delete.cc b/src/nix/store-delete.cc
index e4a3cb554..aa7a8b12f 100644
--- a/src/nix/store-delete.cc
+++ b/src/nix/store-delete.cc
@@ -2,6 +2,7 @@
 #include "common-args.hh"
 #include "shared.hh"
 #include "store-api.hh"
+#include "gc-store.hh"
 
 using namespace nix;
 
@@ -32,12 +33,14 @@ struct CmdStoreDelete : StorePathsCommand
 
     void run(ref<Store> store, std::vector<StorePath> && storePaths) override
     {
+        auto & gcStore = requireGcStore(*store);
+
         for (auto & path : storePaths)
             options.pathsToDelete.insert(path);
 
         GCResults results;
         PrintFreed freed(true, results);
-        store->collectGarbage(options, results);
+        gcStore.collectGarbage(options, results);
     }
 };
 
diff --git a/src/nix/store-gc.cc b/src/nix/store-gc.cc
index a2d74066e..21718dc0c 100644
--- a/src/nix/store-gc.cc
+++ b/src/nix/store-gc.cc
@@ -2,6 +2,7 @@
 #include "common-args.hh"
 #include "shared.hh"
 #include "store-api.hh"
+#include "gc-store.hh"
 
 using namespace nix;
 
@@ -33,10 +34,12 @@ struct CmdStoreGC : StoreCommand, MixDryRun
 
     void run(ref<Store> store) override
     {
+        auto & gcStore = requireGcStore(*store);
+
         options.action = dryRun ? GCOptions::gcReturnDead : GCOptions::gcDeleteDead;
         GCResults results;
         PrintFreed freed(options.action == GCOptions::gcDeleteDead, results);
-        store->collectGarbage(options, results);
+        gcStore.collectGarbage(options, results);
     }
 };