empty column name in error message

Hi,

I wonder if it's worthwhile to fix the following not-so-friendly error message:

create index on foo ((row(a)));
ERROR:  column "" has pseudo-type record

For example, the attached patch makes it this:

create index on foo ((row(a)));
ERROR:  column "row" has pseudo-type record

Note that "row" as column name has been automatically chosen by the caller.

Thanks,
Amit