$ git clone [email protected]:nix-community/nixvim.git --depth=1 nixvim_shallow
Cloning into 'nixvim_shallow'...
remote: Enumerating objects: 1977, done.
remote: Counting objects: 100% (1977/1977), done.
remote: Compressing objects: 100% (1255/1255), done.
remote: Total 1977 (delta 103), reused 1541 (delta 52), pack-reused 0 (from 0)
Receiving objects: 100% (1977/1977), 1.09 MiB | 3.11 MiB/s, done.
Resolving deltas: 100% (103/103), done.

$ cd nixvim_shallow

$ nix-instantiate --eval --show-trace -A outPath
error:
       … while evaluating the attribute 'defaultNix'
         at /nix/store/8694kanhi1kzc34kg81l33pvn638qvnh-source/default.nix:234:5:
          233|
          234|     defaultNix =
             |     ^
          235|       (builtins.removeAttrs result ["__functor"])

       … in the left operand of the update (//) operator
         at /nix/store/8694kanhi1kzc34kg81l33pvn638qvnh-source/default.nix:236:7:
          235|       (builtins.removeAttrs result ["__functor"])
          236|       // (if result ? defaultPackage.${system} then { default = result.defaultPackage.${system}; } else {})
             |       ^
          237|       // (if result ? packages.${system}.default then { default = result.packages.${system}.default; } else {});

       … while calling the 'removeAttrs' builtin
         at /nix/store/8694kanhi1kzc34kg81l33pvn638qvnh-source/default.nix:235:8:
          234|     defaultNix =
          235|       (builtins.removeAttrs result ["__functor"])
             |        ^
          236|       // (if result ? defaultPackage.${system} then { default = result.defaultPackage.${system}; } else {})

       … from call site
         at /nix/store/8694kanhi1kzc34kg81l33pvn638qvnh-source/default.nix:227:10:
          226|     else if lockFile.version >= 5 && lockFile.version <= 7
          227|     then allNodes.${lockFile.root}
             |          ^
          228|     else throw "lock file '${lockFilePath}' has unsupported version ${toString lockFile.version}";

       … while calling anonymous lambda
         at /nix/store/8694kanhi1kzc34kg81l33pvn638qvnh-source/default.nix:159:13:
          158|     builtins.mapAttrs
          159|       (key: node:
             |             ^
          160|         let

       … in the condition of the assert statement
         at /nix/store/8694kanhi1kzc34kg81l33pvn638qvnh-source/default.nix:214:13:
          213|           if node.flake or true then
          214|             assert builtins.isFunction flake.outputs;
             |             ^
          215|             result

       … while calling the 'isFunction' builtin
         at /nix/store/8694kanhi1kzc34kg81l33pvn638qvnh-source/default.nix:214:20:
          213|           if node.flake or true then
          214|             assert builtins.isFunction flake.outputs;
             |                    ^
          215|             result

       … while calling the 'import' builtin
         at /nix/store/8694kanhi1kzc34kg81l33pvn638qvnh-source/default.nix:170:19:
          169|
          170|           flake = import (outPath + "/flake.nix");
             |                   ^
          171|

       … while realising the context of path '/nix/store/vpn8hj1w4g8d6d6knc2sxy4ly5nrxsp1-nixvim_shallow/flake.nix'

       error: path '/nix/store/vpn8hj1w4g8d6d6knc2sxy4ly5nrxsp1-nixvim_shallow' is not valid

$ nix eval --show-trace --file . outPath
"/nix/store/vpn8hj1w4g8d6d6knc2sxy4ly5nrxsp1-nixvim_shallow"

$ nix-instantiate --eval --show-trace -A outPath
"/nix/store/vpn8hj1w4g8d6d6knc2sxy4ly5nrxsp1-nixvim_shallow"

$ touch foo
$ nix-instantiate --eval --show-trace -A outPath
error:

$ git clone [email protected]:nix-community/nixvim.git nixvim_deep
Cloning into 'nixvim_deep'...
remote: Enumerating objects: 32490, done.
remote: Counting objects: 100% (414/414), done.
remote: Compressing objects: 100% (238/238), done.
remote: Total 32490 (delta 290), reused 195 (delta 175), pack-reused 32076 (from 3)
Receiving objects: 100% (32490/32490), 7.57 MiB | 7.77 MiB/s, done.
Resolving deltas: 100% (22144/22144), done.

$ cd nixvim_deep/

$ nix-instantiate --eval --show-trace -A outPath
"/nix/store/brjpjdl03imkqa3g35q7srd8ckhds2w4-source"

$ touch foo && git add -N foo

$ nix-instantiate --eval --show-trace -A outPath
warning: Git tree '/home/matt/nixvim_deep' is dirty
"/nix/store/x94djbggc5yzslvn8qrg4bf67r7gs276-source"