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Show precise error messages in option merge failures

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For instance, if time.timeZone is defined multiple times, you now get
the error message:

  error: user-thrown exception: The unique option `time.timeZone' is defined multiple times, in `/etc/nixos/configurations/misc/eelco/x11vnc.nix' and `/etc/nixos/configuration.nix'.

while previously you got:

  error: user-thrown exception: Multiple definitions of string. Only one is allowed for this option.

and only an inspection of the stack trace gave a clue as to what
option caused the problem.
This commit is contained in:
Eelco Dolstra
2013-10-28 22:45:57 +01:00
parent dbefab9cf4
commit 73f32d0375
6 changed files with 58 additions and 56 deletions
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nixos/modules/misc/nixpkgs.nix
+1 -1
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@@ -26,7 +26,7 @@ let
configType = mkOptionType {
name = "nixpkgs config";
check = traceValIfNot isConfig;
merge = fold mergeConfig {};
merge = args: fold mergeConfig {};
};
in