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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