This helps with troubleshooting exceptions in config values, which were hard to track down for options with many definitions. The trace will look like: error: while evaluating the attribute 'config.foo' at undefined position: [...] while evaluating the option `foo': [...] while evaluating definitions from `/home/user/mymod.nix': while evaluating 'dischargeProperties' at /home/user/nixpkgs/lib/modules.nix:464:25, called from /home/user/nixpkgs/lib/modules.nix:392:137: while evaluating the attribute 'value' at /home/user/nixpkgs/lib/modules.nix:277:44: Value error! where the `/home/user/mymod.nix` module is { lib, ... }: { options.foo = lib.mkOption { type = lib.types.lines; }; config.foo = builtins.throw "Value error!"; }wip/yesman
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