Thanks for the explanations, now I got it! Indeed I hadn't known yaml 
outside of pandoc headers, so the three dots were news to me... I think I 
did try them at some point yesterday but there was some other ill-formed 
stuff in the file that kept giving me aeson errors (which seem to be 
notoriously inscrutable?)... so now I rewrote that file from scratch and it 
works.
Thanks!
On Wednesday, September 6, 2023 at 3:09:00 AM UTC-4 Bastien DUMONT wrote:

> If you still test an empty YAML file, the parser is right: is expects a 
> mapping after the line of dashes, and you don't provide one. Please fill 
> you YAML file!
>
> Le Tuesday 05 September 2023 à 04:51:41PM, t t a écrit :
> > Hm, I just tried that - that gives me an aeson exception:
> > Aeson exception:                                                         
>      
> >                                        
> > Error in $: Expected a mapping                                           
>      
> >                                        
> >                                                                         
>        
> >                                        
> > shell returned 64  
> > 
> > On Tuesday, September 5, 2023 at 5:28:21 PM UTC-4 Bastien DUMONT wrote:
> > 
> > > The yaml used to reproduce the error is absolutely
> > > minimal (just two lines with three dashes each will reproduce the
> > error). 
> > 
> > It doesn't happen to me when I end the file with three points instead of
> > three dashes.
> > 
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