error: cannot coerce a set to a string: { workspace = true; }
       at /nix/store/nzn5hl43r4acnflxb49s43nr6bhj4cdb-source/nix/checks.nix:62:90
       … while evaluating a path segment at /nix/store/nzn5hl43r4acnflxb49s43nr6bhj4cdb-source/nix/checks.nix:62:90
       … while calling the '__isFunction' builtin at /nix/store/87lfqfz7mc5dm4w75qikxhd6lkr9jisr-source/lib/trivial.nix:1131:8
       … while calling anonymous lambda at /nix/store/87lfqfz7mc5dm4w75qikxhd6lkr9jisr-source/lib/trivial.nix:1131:5
       … from call site at /nix/store/87lfqfz7mc5dm4w75qikxhd6lkr9jisr-source/lib/trivial.nix:1211:22
       … while calling 'toFunction' at /nix/store/87lfqfz7mc5dm4w75qikxhd6lkr9jisr-source/lib/trivial.nix:1211:16
       … from call site at /nix/store/87lfqfz7mc5dm4w75qikxhd6lkr9jisr-source/pkgs/build-support/trivial-builders/default.nix:88:24
       … while evaluating attribute 'buildCommand' of derivation 'iets-version' at /nix/store/87lfqfz7mc5dm4w75qikxhd6lkr9jisr-source/pkgs/build-support/trivial-builders/default.nix:88:9
       … while evaluating derivation 'iets-version'
  whose name attribute is located at /nix/store/87lfqfz7mc5dm4w75qikxhd6lkr9jisr-source/pkgs/stdenv/generic/make-derivation.nix:651:11
       … while calling the 'derivationStrict' builtin at «derivation-internal»:36:12
       … while evaluating the attribute 'drvPath' at «derivation-internal»:50:7