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-rw-r--r--src/nix/installables.cc6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/nix/installables.cc b/src/nix/installables.cc
index 4da736f4d5..59162fdc11 100644
--- a/src/nix/installables.cc
+++ b/src/nix/installables.cc
@@ -16,6 +16,8 @@ Value * SourceExprCommand::getSourceExpr(EvalState & state)
 {
     if (vSourceExpr) return vSourceExpr;
 
+    auto sToplevel = state.symbols.create("_toplevel");
+
     vSourceExpr = state.allocValue();
 
     if (file != "") {
@@ -29,7 +31,9 @@ Value * SourceExprCommand::getSourceExpr(EvalState & state)
 
         auto searchPath = state.getSearchPath();
 
-        state.mkAttrs(*vSourceExpr, searchPath.size());
+        state.mkAttrs(*vSourceExpr, searchPath.size() + 1);
+
+        mkBool(*state.allocAttr(*vSourceExpr, sToplevel), true);
 
         std::unordered_set<std::string> seen;