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-rw-r--r--src/libexpr/primops/fetchMercurial.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/primops/fetchMercurial.cc b/src/libexpr/primops/fetchMercurial.cc
index 1cd481243..c23480853 100644
--- a/src/libexpr/primops/fetchMercurial.cc
+++ b/src/libexpr/primops/fetchMercurial.cc
@@ -15,7 +15,7 @@ static void prim_fetchMercurial(EvalState & state, const Pos & pos, Value * * ar
std::string name = "source";
PathSet context;
- state.forceValue(*args[0]);
+ state.forceValue(*args[0], pos);
if (args[0]->type() == nAttrs) {