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-rw-r--r--tests/url/driver.cxx2
1 files changed, 2 insertions, 0 deletions
diff --git a/tests/url/driver.cxx b/tests/url/driver.cxx
index 95fe9cb..b48e2ed 100644
--- a/tests/url/driver.cxx
+++ b/tests/url/driver.cxx
@@ -137,6 +137,8 @@ int
main (int argc, const char* argv[])
try
{
+ using butl::nullopt; // Disambiguate with std::nullopt.
+
using wurl = basic_url<scheme>;
using wurl_authority = wurl::authority_type;
using wurl_host = wurl::host_type;