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-rw-r--r--src/libexpr/nixexpr.hh1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh
index 4c55cb64b..ce3ee9f4d 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -20,6 +20,7 @@ MakeError(UndefinedVarError, Error);
MakeError(MissingArgumentError, EvalError);
MakeError(RestrictedPathError, Error);
+extern std::function<void(const Error & error, const Env & env)> debuggerHook;
/* Position objects. */