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-rw-r--r--tests/test/script/runner/driver.cxx2
1 files changed, 2 insertions, 0 deletions
diff --git a/tests/test/script/runner/driver.cxx b/tests/test/script/runner/driver.cxx
index b31acb7..43bb66b 100644
--- a/tests/test/script/runner/driver.cxx
+++ b/tests/test/script/runner/driver.cxx
@@ -32,6 +32,8 @@ stack_overflow (bool overflow)
int
main (int argc, char* argv[])
{
+ using butl::optional;
+
// Usage: driver [-i <int>] (-o <string>)* (-e <string>)* (-f <file>)*
// (-d <dir>)* [(-t (a|m|s|z)) | (-s <int>)]
//