step4 compilation fails

[greenfork]

I don't know whether this is fidget-related or only here, so I create an issue in this repo.

$ nim --version
Nim Compiler Version 1.4.6 [Linux: amd64]
Compiled at 2021-04-15
Copyright (c) 2006-2020 by Andreas Rumpf

git hash: 2b6b08032348939e5d355a6cb4faa0169306c17f
active boot switches: -d:release

$ nim c step4.nim
Hint: used config file '/home/grfork/.choosenim/toolchains/nim-1.4.6/config/nim.cfg' [Conf]
Hint: used config file '/home/grfork/.choosenim/toolchains/nim-1.4.6/config/config.nims' [Conf]
...........................................................................
/home/grfork/.nimble/pkgs/fidget-0.7.5/fidget/common.nim(255, 17) Error: object constructor needs an object type