Please describe the problem:
Defining a constant string and trying to initialize it by concatenating eg. another constant with a string will result in a gcc error.



Steps to reproduce:
using GLib;

public class FunWithConstants {

	public const string TESTSTRING = "This is a Teststring.";
	public const string ANOTHER_TESTSTRING = TESTSTRING + "This is another Teststring.";
	


	public int main(string[] argv){
		stdout.printf(ANOTHER_TESTSTRING);
		return 0;
	}
}

Will result in an error:

error.c: In function »fun_with_constants_main«:
error.c:19: Error: Invalid operand for binary +
error: cc exited with status 256
Compilation failed: 1 error(s), 0 warning(s)

Looking at the header file, the culprit:

#define FUN_WITH_CONSTANTS_TESTSTRING "This is a Teststring."
#define FUN_WITH_CONSTANTS_ANOTHER_TESTSTRING FUN_WITH_CONSTANTS_TESTSTRING + "This is another Teststring."

Expected result 

#define FUN_WITH_CONSTANTS_TESTSTRING "This is a Teststring."
#define FUN_WITH_CONSTANTS_ANOTHER_TESTSTRING FUN_WITH_CONSTANTS_TESTSTRING  "This is another Teststring."




Actual results:


Expected results:


Does this happen every time?


Other information: