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-rw-r--r--src/libexpr/attr-path.hh3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libexpr/attr-path.hh b/src/libexpr/attr-path.hh
index 1eae64625..fcccc39c8 100644
--- a/src/libexpr/attr-path.hh
+++ b/src/libexpr/attr-path.hh
@@ -12,4 +12,7 @@ MakeError(AttrPathNotFound, Error);
Value * findAlongAttrPath(EvalState & state, const string & attrPath,
Bindings & autoArgs, Value & vIn);
+/* Heuristic to find the filename and lineno or a nix value. */
+Pos findDerivationFilename(EvalState & state, Value & v, std::string what);
+
}