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-rw-r--r--src/libexpr/eval.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 674b08f45..c8ee63551 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -82,7 +82,7 @@ public:
/* The allowed filesystem paths in restricted or pure evaluation
mode. */
- std::experimental::optional<PathSet> allowedPaths;
+ std::optional<PathSet> allowedPaths;
Value vEmptySet;