dhall-to-nix generate incorrect Nix for sum types

[ocharles]

$ /nix/store/hi06lr4hfq52krhkr99vdfxda836mbzz-dhall-nix-1.1.6/bin/dhall-to-nix <<< '<Foo>.Foo'
{}.Foo

$ nix-instantiate --eval-only -E $( /nix/store/hi06lr4hfq52krhkr99vdfxda836mbzz-dhall-nix-1.1.6/bin/dhall-to-nix <<< '<Foo>.Foo' )
error: attribute 'Foo' missing, at (string):1:1

/nix/store/hi06lr4hfq52krhkr99vdfxda836mbzz-dhall-nix-1.1.6 is the latest linux-dhall-nix build: https://hydra.dhall-lang.org/build/10712#tabs-details

Note this also happens with sum types with arguments:

$ /nix/store/hi06lr4hfq52krhkr99vdfxda836mbzz-dhall-nix-1.1.6/bin/dhall-to-nix <<< '<Foo : Bool >.Foo True'
{}.Foo true

[ocharles]

It seems it's fine with the "old" syntax:

$ /nix/store/hi06lr4hfq52krhkr99vdfxda836mbzz-dhall-nix-1.1.6/bin/dhall-to-nix <<< '<Foo = True >'
{ Foo }:
  Foo true