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-rw-r--r--butl/optional2
1 files changed, 1 insertions, 1 deletions
diff --git a/butl/optional b/butl/optional
index 86bbe59..0ae7e7b 100644
--- a/butl/optional
+++ b/butl/optional
@@ -12,7 +12,7 @@ namespace butl
// Simple optional class template while waiting for std::optional.
//
struct nullopt_t {constexpr nullopt_t (int) {}};
- constexpr nullopt_t nullopt = 1;
+ constexpr const nullopt_t nullopt = 1;
template <typename T>
class optional