bug#36777: Guix Inferiors: Curious incorrect derivation output bug

[Ludovic Courtès]

Hi Carl,

Carl Dong <address@hidden> skribis:

> Yes! The patch actually fixed the problem when applied on top of 
> 5cf4b26d52bcea382d98fb4becce89be9ee37b55!

[...]

> Not sure what the next steps are for this, but I'd very much like to 
> understand where this went wrong. Perhaps we could write tests for this so it 
> doesn't happen in the future for releases.

Yup, I understood when this could happen (if multiple inputs of a
derivation are “fixed-output” derivations leading to the same output),
wrote a test for that, and came up with a simpler fix in commit
268896444bed7b958add74b2e1e86ff802c5f5cb.

Let me know if anything is amiss!

Thanks for testing the patch,
Ludo’.