isl_test_cpp17-generic.cc: work around std::optional::value issue in older macOS

[isl.git] / test_inputs / flow / may_loop-tree.flow

must_dependence: "{  }"
may_dependence: "{ T[i] -> [S[] -> a[]] : 0 <= i <= 9 }"
must_no_source: "{  }"
may_no_source: "{ S[] -> a[] }"