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-rw-r--r--third_party/nix/src/libexpr/value-to-xml.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/libexpr/value-to-xml.cc b/third_party/nix/src/libexpr/value-to-xml.cc
index 2a46ac84be61..ea1a85a89719 100644
--- a/third_party/nix/src/libexpr/value-to-xml.cc
+++ b/third_party/nix/src/libexpr/value-to-xml.cc
@@ -20,7 +20,7 @@ static void printValueAsXML(EvalState& state, bool strict, bool location,
                             PathSet& drvsSeen);
 
 static void posToXML(XMLAttrs& xmlAttrs, const Pos& pos) {
-  xmlAttrs["path"] = pos.file;
+  xmlAttrs["path"] = pos.file.value();
   xmlAttrs["line"] = (format("%1%") % pos.line).str();
   xmlAttrs["column"] = (format("%1%") % pos.column).str();
 }