Can't initialize const member of struct

[mlbrooks]

Declare struct thingy with field foo. In the "broken" version, foo is const. Declare a constructor for thingy that initializes foo from constant 5. In the "broken" version, CFA-cc passes bad C code to GCC; this code tries to take address of address.

cat scratch.cfa

struct thingy {
  #if broken
  const
  #endif
    size_t foo; 
};
void ?{}(thingy &this) with(this) { 
  foo{ 5 }; 
}

driver/cfa scratch.cfa -Dbroken
error: lvalue required as unary ‘&’ operand

driver/cfa scratch.cfa
(works)

driver/cfa scratch.cfa -Dbroken -CFA

((void)(((void)(_tmp_ctor_expr0=(*((unsigned long int **)(&(&(*_X4thisS6thingy_1)._X3fooKm_1)))
                                )
               )
        )
       ,(((void)((*_tmp_ctor_expr0)=((unsigned long int )5)) /* ?{} */)
        ,_tmp_ctor_expr0
        )
       )
);

driver/cfa scratch.cfa -CFA

((void)(((void)(_tmp_ctor_expr0=(                           &(*_X4thisS6thingy_1)._X3foom_1
                                )
               )
        )
       ,(((void)((*_tmp_ctor_expr0)=((unsigned long int )5)) /* ?{} */)
        ,_tmp_ctor_expr0
        )
       )
);