error:
       … while evaluating the condition of the assertion '({ ding = false; } == { ding = null; })'
         at /pwd/lang/eval-fail-assert-equal-type-nested.nix:1:1:
            1| assert { ding = false; } == { ding = null; };
             | ^
            2| abort "unreachable"

       … while comparing attribute 'ding'

       … where left hand side is
         at /pwd/lang/eval-fail-assert-equal-type-nested.nix:1:10:
            1| assert { ding = false; } == { ding = null; };
             |          ^
            2| abort "unreachable"

       … where right hand side is
         at /pwd/lang/eval-fail-assert-equal-type-nested.nix:1:31:
            1| assert { ding = false; } == { ding = null; };
             |                               ^
            2| abort "unreachable"

       error: a Boolean of value 'false' is not equal to null of value 'null'