Fixed false "Non constant initializers" error messages on wrong places, which could be resulted from failed array declarations etc.

test/ref/custom-reference-error.c

@@ -14,7 +14,7 @@
 */
 
 typedef short return_t;
-#error /* produce an error */
+#error This is an/* produce an error */error
 
 return_t main(int argc, char* argv[])
 {
@@ -22,3 +22,6 @@ return_t main(int argc, char* argv[])
     n = 0;                /* produce an error */
     /* produce a warning */
 }
+
+int arr[main(0, 0)]; /* produce an error */
+int b = 0;

test/ref/custom-reference-error.cref

@@ -1,6 +1,7 @@
-custom-reference-error.c:17: Error: #error
+custom-reference-error.c:17: Error: #error: This is an error
 custom-reference-error.c:21: Error: Call to undeclared function 'printf'
 custom-reference-error.c:22: Error: Undeclared identifier 'n'
 custom-reference-error.c:24: Warning: Control reaches end of non-void function [-Wreturn-type]
 custom-reference-error.c:24: Warning: Parameter 'argc' is never used
 custom-reference-error.c:24: Warning: Parameter 'argv' is never used
+custom-reference-error.c:26: Error: Constant integer expression expected