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error:
       … while evaluating an expression to select 'drvPath' on it
         at «internal»:1:552:
       … while evaluating strict
         at «internal»:1:552:
       … while calling the 'derivationStrict' builtin
         at «internal»:1:208:
       … while evaluating derivation 'foo'
         whose name attribute is located at /test-home/import-derivation.nix:21:3
         at /test-home/import-derivation.nix:21:3:
           20| mkDerivation {
           21|   name = "foo";
             |   ^
           22|   builder = builtins.toFile "builder.sh"

       … while evaluating attribute 'args' of derivation 'foo'
         at /test-home/config.nix:26:7:
           25|       builder = shell;
           26|       args = ["-e" args.builder or (builtins.toFile "builder-${args.name}.sh" ''
             |       ^
           27|         if [ -e "$NIX_ATTRS_SH_FILE" ]; then source $NIX_ATTRS_SH_FILE; fi;

       … while evaluating the attribute 'builder'
         at /test-home/import-derivation.nix:22:3:
           21|   name = "foo";
           22|   builder = builtins.toFile "builder.sh"
             |   ^
           23|     ''

       … while calling the 'toFile' builtin
         at /test-home/import-derivation.nix:22:13:
           21|   name = "foo";
           22|   builder = builtins.toFile "builder.sh"
             |             ^
           23|     ''

       … while evaluating the second argument passed to builtins.toFile

       … while calling the 'toString' builtin
         at /test-home/import-derivation.nix:24:20:
           23|     ''
           24|       echo -n FOO${toString value} > $out
             |                    ^
           25|     '';

       … while calling the 'pathExists' builtin
         at /test-home/import-derivation.nix:15:12:
           14|     # Test that pathExists can check the existence of /nix/store paths
           15|     assert builtins.pathExists bar;
             |            ^
           16|     import bar;

       … while realising the context of path '/nix/store/hashfilteredforrepeatableoutputs-bar'

       error: cannot build '/nix/store/hashfilteredforrepeatableoutputs-bar.drv^out' during evaluation because the option 'allow-import-from-derivation' is disabled

       note: trace involved the following derivations:
       derivation 'foo'