error: … while evaluating the attribute 'outPath' at <nix/derivation-internal.nix>:<number>:<number>: <number>| value = commonAttrs // { <number>| outPath = builtins.getAttr outputName strict; | ^ <number>| drvPath = strict.drvPath; … while calling the 'getAttr' builtin at <nix/derivation-internal.nix>:<number>:<number>: <number>| value = commonAttrs // { <number>| outPath = builtins.getAttr outputName strict; | ^ <number>| drvPath = strict.drvPath; … while calling the 'derivationStrict' builtin at <nix/derivation-internal.nix>:<number>:<number>: <number>| <number>| strict = derivationStrict drvAttrs; | ^ <number>| … while evaluating derivation '~jiggle~' whose name attribute is located at /pwd/lang/eval-fail-derivation-name.nix:<number>:<number> error: invalid derivation name: name '~jiggle~' contains illegal character '~'. Please pass a different 'name'.