> <standard input>:5: missing `]'
> <standard input>:5: invalid component `a' in composite glyph name
Well, the parsing for `\[...]' happens before feeding the data to
\A'...', IIRC.
> Is this a general parser problem, i haven't looked yet..
I wouldn't call it a `general parser problem'. Basically, you can't
generate `\[' programmatically, as far as I can see. If you ever get
this warning, it's an error in the input.
> Should i open a bug report?
Probably yes, but it's rather a documentation thing IMHO.
Werner