gegen max does not properly evaluate string expressions about stata-gtools HOT 2 CLOSED

@adamreir I put that warning there to make it plain this was not parsed in the same way as by varlist: egen (i.e. it's parsed by creating the temporary variable first). However, I forgot about this Stata quirk with strings, which has gotten me many times over the years. You can replace lines 646 and 647 in egen.ado with

                mata printf("{bf:warning}: gegen is {bf:NOT} parsing the expression '%s' by group.\n", st_local("args"))
                mata printf("To parse this expression by group, call gegen using the -by:- prefix.\n")

or delete them if you understand the warning.

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Oh, right. I didn't consider the possibility the bug was in the error message and not in the parsing. That does fix the issue.

Thanx again!

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