Octave: error() must be called with an argument

Examples/test-suite/octave/primitive_ref_runme.m

@@ -1,53 +1,53 @@
 primitive_ref
 
 if (ref_int(3) != 3)
-    error
+    error("failed");
 endif
 
 if (ref_uint(3) != 3)
-    error
+    error("failed");
 endif
 
 if (ref_short(3) != 3)
-    error
+    error("failed");
 endif
 
 if (ref_ushort(3) != 3)
-    error
+    error("failed");
 endif
 
 if (ref_long(3) != 3)
-    error
+    error("failed");
 endif
 
 if (ref_ulong(3) != 3)
-    error
+    error("failed");
 endif
 
 if (ref_schar(3) != 3)
-    error
+    error("failed");
 endif
 
 if (ref_uchar(3) != 3)
-    error
+    error("failed");
 endif
 
 if (ref_float(3.5) != 3.5)
-    error
+    error("failed");
 endif
 
 if (ref_double(3.5) != 3.5)
-    error
+    error("failed");
 endif
 
 if (ref_bool(true) != true)
-    error
+    error("failed");
 endif
 
 if (!strcmp(ref_char('x'),'x'))
-    error
+    error("failed");
 endif
 
 if (ref_over(0) != 0)
-    error
+    error("failed");
 endif