bug#59956: 29.0.60: Failure when completing arguments in Eshell after variable interpolation

[Jim Porter]

On 12/12/2022 2:21 PM, Gregory Heytings wrote:
> I'm still not Stefan, but this bug is fixed by the attached patch.

Thanks. This is pretty close to what I was thinking (I tried almost the 
exact same patch locally, but wasn't sure if there was a better way). 
Personally, I think something like your patch would probably be the 
safest bet for the 29 branch.

Still, like Stefan and Augusto mentioned, there's probably a larger 
issue here: should Eshell be allowed to feed Pcomplete non-strings? 
Since Pcomplete was written for Eshell initially, there's some basis for 
why it *might* support non-string values, but actually requiring that is 
an awful lot to ask of every programmer who ever wants to write a 
pcomplete function.