error: … while evaluating 'a' to select 'foo' on it at /pwd/lang/eval-fail-recursion.nix:1:21: 1| let a = {} // a; in a.foo | ^ 2| … in the right operand of the update (//) operator at /pwd/lang/eval-fail-recursion.nix:1:12: 1| let a = {} // a; in a.foo | ^ 2| error: infinite recursion encountered at /pwd/lang/eval-fail-recursion.nix:1:15: 1| let a = {} // a; in a.foo | ^ 2|