Nix flake autocomplete is broken

[arianvp]

Describe the bug

Autocomplete just hangs forever

Steps To Reproduce
nix build .#<TAB>

Expected behavior

List of packages; but instead the terminal hangs forever

nix (Nix) 3.0pre20201020_e0ca98

Additional context

Add any other context about the problem here.

[edolstra]

Can't reproduce, this works for me.

[thufschmitt]

If your client and the globally installed Nix are out-of-sync, it might be linked to

This is a breaking change for the existing bash completion script (which can cause some minor issues if one updates the Nix client but not the script), but afaik it hasn't made it to any release yet, so it shouldn't be a major issue.

(from #4128).

It'll be a bit surprising because I'd expect bash to output some garbage completion in that case rather than nothing, but bash being bash, maybe it just goes crazy

[arianvp]

This could very well be my global bash completion conflicting. Let me check to be sure; but otherwise we can close this

[arianvp]

Can't reproduce anymore either.