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-rw-r--r--src/libexpr/eval.hh3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index d0f298e168e9..9fe3878916d5 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -316,6 +316,9 @@ private:
 /* Return a string representing the type of the value `v'. */
 string showType(const Value & v);
 
+/* Decode a context string ‘!<name>!<path>’ into a pair <path,
+   name>. */
+std::pair<string, string> decodeContext(const string & s);
 
 /* If `path' refers to a directory, then append "/default.nix". */
 Path resolveExprPath(Path path);