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Without the change the eval fails as:
$ nix-instantiate -A pypy310Packages.xarray.optional-dependencies.complete
error:
… while evaluating a path segment
at pkgs/development/python-modules/xarray/default.nix:96:27:
95| ];
96| complete = with self; accel ++ io ++ etc ++ parallel + viz;
| ^
97| });
error: cannot coerce a list to a string: [ «thunk» «thunk» «thunk» «thunk» «thunk» «thunk» «thunk» «thunk» «thunk» «thunk» «13 items elided» ]
This happens because of `+` concat operator instead of `++`.