Nix: Poor diagnostics for set -> string type coercion errors.
I found this error quite unhelpful:
$ sudo nixos-rebuild test
building Nix...
building the system configuration...
error: cannot coerce a set to a string, at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/types.nix":103:79
(use ‘--show-trace’ to show detailed location information)
The position given for the error is within the NixOS source, so I figured I'd run it again with --show-trace.
$ sudo nixos-rebuild test --show-trace
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/nixpkgs/nixos/modules/system/activation/top-level.nix":228:5:
while evaluating ‘fold’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":20:19, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/nixos/modules/system/activation/top-level.nix":122:12:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":27:8:
while evaluating ‘showWarnings’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/nixos/modules/system/activation/top-level.nix":91:18, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/nixos/modules/system/activation/top-level.nix":98:16:
while evaluating ‘fold’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":20:19, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/nixos/modules/system/activation/top-level.nix":91:23:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":27:8:
while evaluating the attribute ‘warnings’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/attrsets.nix":135:44:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":26:45, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/attrsets.nix":135:52:
while evaluating the attribute ‘value’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":206:9:
while evaluating the option `warnings':
while evaluating ‘id’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/trivial.nix":9:8, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":204:15:
while evaluating ‘fold’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":20:19, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":187:12:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":27:8:
while evaluating ‘filterOverrides’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":277:21, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":182:20:
while evaluating ‘concatMap’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":54:18, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":284:8:
while evaluating ‘concatMap’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":54:18, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":110:20:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":110:31, called from undefined position:
while evaluating ‘dischargeProperties’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":247:25, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":112:65:
while evaluating the attribute ‘config."${name}"’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/nixos/modules/system/boot/systemd.nix":891:5:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/attrsets.nix":160:10, called from undefined position:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/nixos/modules/system/boot/systemd.nix":891:51, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/attrsets.nix":160:16:
while evaluating ‘optional’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":105:20, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/nixos/modules/system/boot/systemd.nix":892:7:
while evaluating the attribute ‘serviceConfig.Type’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/attrsets.nix":135:44:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":26:45, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/attrsets.nix":135:52:
while evaluating the attribute ‘value’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":206:9:
while evaluating the option `systemd.services.cron.serviceConfig':
while evaluating ‘id’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/trivial.nix":9:8, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":204:15:
while evaluating ‘fold’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":20:19, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":187:12:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":27:8:
while evaluating ‘filterOverrides’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":277:21, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":182:20:
while evaluating ‘concatMap’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":54:18, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":284:8:
while evaluating ‘concatMap’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":54:18, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":110:20:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":110:31, called from undefined position:
while evaluating ‘dischargeProperties’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":247:25, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":112:65:
while evaluating the attribute ‘condition’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":324:14:
while evaluating the attribute ‘condition’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":324:14:
while evaluating the attribute ‘preStart’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/attrsets.nix":135:44:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":26:45, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/attrsets.nix":135:52:
while evaluating the attribute ‘value’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":206:9:
while evaluating the option `systemd.services.cron.preStart':
while evaluating ‘id’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/trivial.nix":9:8, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":204:15:
while evaluating ‘fold’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":20:19, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":187:12:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":27:8:
while evaluating ‘filterOverrides’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":277:21, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":182:20:
while evaluating ‘concatMap’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":54:18, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":284:8:
while evaluating ‘concatMap’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":54:18, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":110:20:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":110:31, called from undefined position:
while evaluating ‘dischargeProperties’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":247:25, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":112:65:
while evaluating the attribute ‘config."${name}"’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/nixos/modules/services/scheduling/cron.nix":105:9:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/nixos/modules/services/scheduling/cron.nix":28:19, called from undefined position:
while evaluating the attribute ‘text’ of the derivation ‘system-crontab’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/pkgs/build-support/trivial-builders.nix":10:14:
while evaluating the attribute ‘paths’ of the derivation ‘system-path’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/pkgs/build-support/trivial-builders.nix":10:14:
while evaluating the attribute ‘environment.systemPackages’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/attrsets.nix":135:44:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":26:45, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/attrsets.nix":135:52:
while evaluating the attribute ‘value’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":206:9:
while evaluating the option `environment.systemPackages':
while evaluating ‘id’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/trivial.nix":9:8, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":204:15:
while evaluating ‘fold’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":20:19, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:11:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":27:8:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":197:22, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘check’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/types.nix":112:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/modules.nix":198:16:
while evaluating ‘fold’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":20:19, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/types.nix":112:38:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":27:8:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":94:24, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":94:24, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":94:24, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":94:24, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":94:24, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘fold'’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":23:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:34:
while evaluating anonymous function at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":94:24, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":26:14:
while evaluating ‘check’ at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/types.nix":103:15, called from "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/lists.nix":94:30:
cannot coerce a set to a string, at "/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/lib/types.nix":103:79
Eventually I traced the error to my use of ghc (a set) rather than ghc.ghc784 (a package) in environment.systemPackages. The trace fails to mention ghc, its contents or its location in the configuration file (/etc/nixos/configuration:64). Ideally, I would have liked an error like this:
error: expected a value of type 'package' in 'environment.systemPackages' but received 'ghc' of type 'set' at "/etc/nixos/configuration":64:5
michaelsproul
👀1
All 7 comments
These can get very ugly. Right now the evaluator with --show-trace only output
error: value is a string while a set was expected
and _no trace at all_. It took me hours before I found where the problem was, among the thousands of (texlive) packages.
vcunat
on 8 Sep 2015
Using my latest noisy-nix commits (https://github.com/NixOS/nix/pull/612) the errors show as follows:
$ ~/nix/inst/bin/nix-instantiate . --eval --show-trace --strict -A pkgs.texlive.scheme-full
error: while evaluating the attribute ‘pkgs’ at ~/nixpkgs-test/pkgs/tools/typesetting/tex/texlive-new/default.nix:104:7-104:11:
while evaluating list position ‘10928’:
while evaluating a black hole:
value is a string at ~/nixpkgs-test/pkgs/tools/typesetting/tex/texlive-new/bin.nix:17:15-17:19 while a set was expected at ~/nixpkgs-test/pkgs/tools/typesetting/tex/texlive-new/default.nix:113:15-113:65
$ ~/nix/inst/bin/nix-instantiate --show-trace -E 'with import ./nixos/default.nix { configuration = (a @ {pkgs, ...}: (import /etc/nixos/configuration.nix a) // { environment.systemPackages = [ pkgs.haskellPackages ]; }); }; system'
...
while evaluating the attribute ‘pkgs’ of the derivation ‘system-path’ at ~/nixpkgs-test/pkgs/build-support/buildenv/default.nix:38:5-38:9:
while evaluating a black hole at ~/nixpkgs-test/pkgs/build-support/buildenv/default.nix:38:5-38:9:
while calling primop toJSON at ~/nixpkgs-test/pkgs/build-support/buildenv/default.nix:38:12-41:14:
while evaluating list position ‘250’ at ~/nixpkgs-test/pkgs/build-support/buildenv/default.nix:38:12-41:14:
while evaluating the attribute ‘paths’ at ~/nixpkgs-test/pkgs/build-support/buildenv/default.nix:39:7-39:12:
while evaluating list position ‘0’ at ~/nixpkgs-test/pkgs/build-support/buildenv/default.nix:39:7-39:12:
while calling anonymous function at ~/nixpkgs-test/lib/types.nix:117:14-117:24 from ~/nixpkgs-test/pkgs/build-support/buildenv/default.nix:39:7-39:12:
while evaluating the attribute ‘value’ at ~/nixpkgs-test/lib/types.nix:117:17-117:24:
while evaluating a black hole at ~/nixpkgs-test/lib/types.nix:117:17-117:24:
while calling primop foldl' at ~/nixpkgs-test/lib/modules.nix:314:19-317:43:
while calling anonymous function at ~/nixpkgs-test/lib/modules.nix:314:32-316:96 from ~/nixpkgs-test/lib/modules.nix:314:19-317:43:
while calling ‘check’ at ~/nixpkgs-test/lib/types.nix:97:15-97:49 from ~/nixpkgs-test/lib/modules.nix:315:10-315:30:
while calling ‘isStorePath’ at ~/nixpkgs-test/lib/strings.nix:224:17-224:112 from ~/nixpkgs-test/lib/types.nix:97:36-97:49:
while calling primop substring at ~/nixpkgs-test/lib/strings.nix:224:20-224:55:
while evaluating a black hole at ~/nixpkgs-test/lib/strings.nix:224:20-224:55:
while calling primop toString at ~/nixpkgs-test/lib/strings.nix:224:44-224:54:
cannot coerce a set at (string):1:132-1:152 to a string at ~/nixpkgs-test/lib/strings.nix:224:44-224:54
Maybe someone will want to review them...
Mathnerd314
on 10 Sep 2015
@Mathnerd314: That looks quite a bit better.
michaelsproul
on 11 Sep 2015
domenkozar
on 19 Oct 2016
👍1
I get this error, for my configuration.nix. I have about 250 values in there. :sob:
It's obviously time to tidy up, but until then:
Are there any debugging _tactics_ to track the problematic value down? :pray:
freddie-freeloader
on 3 Nov 2016
I have use binary search. Comment out half of the file, test, repeat.
bjornfor
on 3 Nov 2016
🎉1
Reminds me of:
Nix won't be complete until it has static typing.
:wink:
freddie-freeloader
on 3 Nov 2016
👍1
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