#include 
#include 
#include 
#include 


//=== Cpp2 type declarations ====================================================


#include "cpp2util.h"

#line 1 "regression-tests/mixed-string-interpolation.cpp2"


//=== Cpp2 type definitions and function declarations ===========================

#line 1 "regression-tests/mixed-string-interpolation.cpp2"
#line 5 "regression-tests/mixed-string-interpolation.cpp2"

struct custom_struct_with_no_stringize_customization { } custom;

#line 8 "regression-tests/mixed-string-interpolation.cpp2"
[[nodiscard]] auto main() -> int;

//=== Cpp2 function definitions =================================================

#line 1 "regression-tests/mixed-string-interpolation.cpp2"

#line 8 "regression-tests/mixed-string-interpolation.cpp2"
[[nodiscard]] auto main() -> int{
    auto a {2}; 
    std::optional b {}; 
    std::cout