Error message recommends repeat ... for, which is not parsed

When I feed this program to STD:

```
do { } for 1;
```

I get the response

```
Unsupported use of do...for;  in Perl 6 please use repeat...for at
```

But feeding

```
 repeat { } for 1;
```

into STD gives

```
 Undeclared routine:␤ 'repeat'
```

So one way or another, std is inconsistent.
