lucasew@acer-nix ~/WORKSPACE/home-manager 1$ nix flake check --show-trace
warning: Git tree '/home/lucasew/WORKSPACE/home-manager' is dirty
warning: flake output attribute 'defaultPackage' is deprecated; use 'packages.<system>.default' instead
error: cannot coerce null to a string
at /nix/store/2hk95qkrlxwcaphx9ryw6bhqphpaixfq-source/pkgs/stdenv/generic/make-derivation.nix:224:60:
223| then attrs.name + hostSuffix
224| else "${attrs.pname}${staticMarker}${hostSuffix}-${attrs.version}";
| ^
225| }) // {
… while evaluating the derivation attribute 'name'
at /nix/store/2hk95qkrlxwcaphx9ryw6bhqphpaixfq-source/pkgs/stdenv/generic/make-derivation.nix:205:7:
204| // (lib.optionalAttrs (attrs ? name || (attrs ? pname && attrs ? version)) {
205| name =
| ^
206| let
… while evaluating the attribute 'depsBuildBuild' of the derivation 'ncurses-6.3'
at /nix/store/2hk95qkrlxwcaphx9ryw6bhqphpaixfq-source/pkgs/stdenv/generic/make-derivation.nix:205:7:
204| // (lib.optionalAttrs (attrs ? name || (attrs ? pname && attrs ? version)) {
205| name =
| ^
206| let
… while evaluating the attribute 'propagatedBuildInputs' of the derivation 'readline-8.1p0'
at /nix/store/2hk95qkrlxwcaphx9ryw6bhqphpaixfq-source/pkgs/stdenv/generic/make-derivation.nix:205:7:
204| // (lib.optionalAttrs (attrs ? name || (attrs ? pname && attrs ? version)) {
205| name =
| ^
206| let
… while evaluating the attribute 'buildInputs' of the derivation 'bash-interactive-5.1-p12'
at /nix/store/2hk95qkrlxwcaphx9ryw6bhqphpaixfq-source/pkgs/stdenv/generic/make-derivation.nix:205:7:
204| // (lib.optionalAttrs (attrs ? name || (attrs ? pname && attrs ? version)) {
205| name =
| ^
206| let
… while evaluating the attribute 'buildCommand' of the derivation 'home-manager'
at /nix/store/2hk95qkrlxwcaphx9ryw6bhqphpaixfq-source/pkgs/stdenv/generic/make-derivation.nix:205:7:
204| // (lib.optionalAttrs (attrs ? name || (attrs ? pname && attrs ? version)) {
205| name =
| ^
206| let
… while checking the derivation 'defaultPackage.i686-cygwin'
at /nix/store/2hk95qkrlxwcaphx9ryw6bhqphpaixfq-source/lib/attrsets.nix:215:41:
214| */
215| nameValuePair = name: value: { inherit name value; };
| ^
216|
… while checking flake output 'defaultPackage'
at /nix/store/p6nc553wd1jza073xcfdls1lpwnsysv8-source/flake.nix:30:7:
29|
30| defaultPackage =
| ^
31| forAllSystems (system: self.packages.${system}.home-manager);
Usually that’s people being unsure whether it’s a real bug or if they’re simply not doing something correctly, so they want eyes on it before reporting, or perhaps because the issue is particularly impactful (I can imagine a big security flaw being an announcement for example).
Generally it’s best to keep issue discussion on github, so all of it is nicely in one place, though. Creating additional issues just creates noise, and potentially diverts useful discussion away from where it can be conveniently tracked.