Placement new an object show warnings by built-in parser

when I type codes as following:

#include <stdlib.h>

class A
{
public:
  A()
  {
    printf("A()\n");
  }
};

int main(int argc, char* argv[])
{
  A* a = malloc(sizeof(A));
  a = new(a) A();
  return 0;
}

there is an syntax warning shows:

after I delete the `()` after A in line 17, the warning disappears.

the reason looks like builtin-parser cannot analysis the empty param list of constructor function in placement new operator.