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error:
       … from call site
         at /pwd/in.nix:1:1:
            1| ({x, y, z}: x + y + z) {x = "foo"; z = "bar";}
             | ^
            2|

       error: function 'anonymous lambda' called without required argument 'y'
       at /pwd/in.nix:1:2:
            1| ({x, y, z}: x + y + z) {x = "foo"; z = "bar";}
             |  ^
            2|