Installables that point to a builtins.storePath or builtins.fetchClosure cannot be used from the command line due to not having a drvPath, yet they can be used if wrapped in a builtins:buildenv or any other derivation wrapper.

Describe the solution you'd like
Allow usage of installables (even flake references) without requiring them to have drvPath's.

Describe alternatives you've considered

• Wrapping each such installable in a builtins:buildenv, which works.
• I tried following the source. It seems that goals need a name, and for attribute/flakerefs it needs a drvPath to "name" the goal, but otherwise it looks like an artificial limitation.
• nix build $(nix eval --impure .#some-attr-with-builtins-storePath) works, which is odd because one would think this could be done automatically

Priorities

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