Octave: error() must be called with an argument

Examples/test-suite/octave/input_runme.m

@@ -7,21 +7,21 @@ input
 
 f = Foo();
 if (f.foo(2) != 4)
-  error
+  error("failed");
 endif
 
 try
   a=f.foo();
-  error
+  error("failed");
 catch
 end_try_catch
 
 if (!strcmp(sfoo("Hello"),"Hello world"))
-  error
+  error("failed");
 endif
 
 try
   a=sfoo();
-  error
+  error("failed");
 catch
 end_try_catch