@cfr it's the help text you get if you type h to the ? prompt at the error
@cfr eg longtable has \LT@err{longtable not in 1-column mode}\@ehc which means you get an error longtable not in 1-column mode and if you type h you get the not very helpful standard help text c which is:
\gdef\@ehc{%
Try typing \space <return> %
\space to proceed.\MessageBreak
If that doesn't work, type \space X <return> \space to quit.}
@DavidCarlisle Thanks. I didn't know you could do that...
Is it possible to get the name of the command into the help text if I'm looping over the missing commands? I can do the definition fine, but I can't figure out how to do the help text. I've tried various numbers of \expandafter s before \string\xx but I'm not good with expansions...
More specifically, I have \@for \xx:=\ebgaramond@maths@dim \do {%
\expandafter\def\xx{\PackageError{ebgaramond-maths}{No \expandafter\string\xx}{use ...}}}
But I just get a 'No \@nil' rather than 'No \leftharpoonup' or whatever.
@DavidCarlisle I've always wondered how people did proper error messages...
@PauloCereda Systems down, My son has (had) fever, cold, breathing trouble, daughter had cold,cough, and They generously donated all these to me. We are all recovering. Besides that all is well :-)
@PauloCereda But those difficulties will be pleasure which one can remember for life time. As children grow, they will have their own world, the happiness a toddler gives reduces gradually. :-)
@PauloCereda Oh!. But it will do. BTW, do you have any other beamer codes in you arsenal? I have exhausted mine and now they all look old. I didn't modify default ones much though.
@egreg as a concession to your age, you can go by motorbike
@egreg choices choices.. make some answers and try to pick up even number of ticks, or not answer, and hope no one accepts any old ones and pick up +60 tomorrow:-)
@egreg yep, sure, I visited the sewage museum on this 1st Sunday of Advent (and I did much more, for example jammed both my middle fingers under a piano chair :-( )
one my nail is quite injured (no bleeding tho) and I've got very badly looking capillary haematoma :( fortunately nothing seems to be broken and no bones smashed