Example struct_casting.cc:
#include <malloc.h>

static struct default_include {
  char *fname;			
  int cplusplus;		
  int cxx_aware;		
} include_defaults_array[]
  = {
    { 0, 1, 1 },
    { 0, 0, 0 }
    };
    
static struct default_include *include_defaults = include_defaults_array;

int main() {
      int num_dirs = 4;
      include_defaults
	= (struct default_include *) malloc ((num_dirs
					       * sizeof (default_include))
					      + sizeof (include_defaults_array));  
    return 1;
}

Failed in parser with messages:
Processing files:
struct_cast.cc]
struct_cast.cc:18:11: unexpected token: (
struct_cast.cc:18:36: unexpected token: )
struct_cast.cc:19:74: expecting SEMICOLON, found ')'
struct_cast.cc:20:80: expecting SEMICOLON, found ')'