NixOS config show trace barf.

gistfile1.txt

sudo nixos-rebuild switch --upgrade --show-trace 
[sudo] password for reuben: 
unpacking channels...
building Nix...
building the system configuration...
error: while evaluating the attribute 'config.system.build.toplevel' at /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/activation/top-level.nix:275:5:
while evaluating 'foldr' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/lists.nix:52:20, called from /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/system/activation/top-level.nix:139:12:
while evaluating 'fold'' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/lists.nix:55:15, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/lists.nix:59:8:
while evaluating the attribute 'assertions' at undefined position:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:84:45, called from undefined position:
while evaluating the attribute 'value' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:379:9:
while evaluating the option `assertions':
while evaluating the attribute 'mergedValue' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:411:5:
while evaluating the attribute 'values' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:405:9:
while evaluating the attribute 'values' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:505:7:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:391:28, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:391:17:
while evaluating 'dischargeProperties' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:464:25, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:392:62:
while evaluating the attribute 'condition' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:549:14:
while evaluating the attribute 'condition' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:549:14:
while evaluating 'foldr' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/lists.nix:52:20, called from /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/tasks/encrypted-devices.nix:11:5:
while evaluating 'fold'' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/lists.nix:55:15, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/lists.nix:59:8:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/nixos/modules/tasks/encrypted-devices.nix:7:21, called from undefined position:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/types.nix:263:14, called from undefined position:
while evaluating the attribute 'value' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:425:27:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:413:22, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:413:9:
while evaluating 'merge' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/types.nix:493:22, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:416:12:
while evaluating the attribute 'config' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:96:25:
while evaluating 'yieldConfig' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:83:29, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:82:16:
while evaluating 'mergeModules' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:233:26, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:73:17:
while evaluating 'mergeModules'' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:237:36, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:234:5:
while evaluating 'flip' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/trivial.nix:138:16, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:280:6:
while evaluating 'byName' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:260:25, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:268:21:
while evaluating 'reverseList' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/lists.nix:393:17, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:73:38:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:167:37, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:68:19:
while evaluating 'filterModules' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:157:36, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:168:7:
while evaluating anonymous function at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:161:31, called from undefined position:
while evaluating 'loadModule' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:106:53, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:144:22:
while evaluating 'unifyModuleSyntax' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:172:34, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:109:14:
while evaluating 'applyIfFunction' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:198:29, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:109:59:
while evaluating 'isFunction' at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/trivial.nix:333:16, called from /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:198:68:
syntax error, unexpected $end, at /dev/dm-0:1:1