CORRUPT JSON when installing a 0.18 package on 0.19

[ktosiek]

Elm version: 0.19.0

When trying to install a package that is not yet available for 0.19 I'm getting a big, scary error:

$ elm install elm-community/result-extra
-- CORRUPT JSON ----------------------------------------------------------------

The elm.json for elm-community/list-extra 1.0.0 got corrupted somehow.

I removed it from my file cache, so if it was some transient error it should be
fixed if you try the same thing again. Please report this if it seems like an
Elm problem though!

I've tried running the command multiple times, and deleting ~/.elm/0.19.0/ - nothing changed.

[wmakley]

I encountered this numerous times when upgrading my 0.18 project to 0.19. It took me a while to figure out I actually just had some dependencies that had not been upgraded yet, or was not using the correct version.