Add in executable a lambda to test.

ortools/math_opt/samples/mathopt_info.cc

@@ -13,6 +13,7 @@
 
 // Check MathOpt available solvers.
 #include <iostream>
+#include <functional>
 
 #include "absl/strings/str_cat.h"
 #include "absl/strings/str_join.h"
@@ -23,6 +24,9 @@
 #include "ortools/math_opt/core/solver_interface.h"
 //#include "ortools/math_opt/cpp/enums.h"
 
+#include <chrono>
+#include <thread>
+
 namespace {
 
 struct SolverTypeProtoFormatter {
@@ -33,11 +37,26 @@ struct SolverTypeProtoFormatter {
   }
 };
 
+void* const kRegisterSolver = [] {
+  std::cerr << "registering " << "PLOP" << std::endl;
+  std::this_thread::sleep_for(std::chrono::milliseconds(500));
+  std::cerr << "registering " << "PLOP" << "...DONE" << std::endl;
+  return nullptr;
+}();
+
 }  // namespace
 
 int main(int argc, char* argv[]) {
+  using namespace std::chrono_literals;
+
   InitGoogle(argv[0], &argc, &argv, /*remove_flags=*/true);
 
+  std::cerr << "sleeping\n";
+  // Thread delayed for 1 seconds
+  std::this_thread::sleep_for(1000ms);
+  //std::this_thread::sleep_for(std::chrono::milliseconds(5000));
+  std::cerr << "sleeping...DONE\n";
+
   std::cout <<
     absl::StrCat(
         "the solver to use, possible values: ",