[Issue 20673] Improve error message for opDollar in pointers

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20673

Nick Treleaven <nick at geany.org> changed:

           What    |Removed                     |Added
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                 CC|                            |nick at geany.org

--- Comment #1 from Nick Treleaven <nick at geany.org> ---
Recent dmd does at least use `$`:

slice.d(20): Error: undefined identifier `$`

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