diff options
Diffstat (limited to 'nix/yants')
| -rw-r--r-- | nix/yants/default.nix | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/nix/yants/default.nix b/nix/yants/default.nix index 058444d27b..2bbf4dd15a 100644 --- a/nix/yants/default.nix +++ b/nix/yants/default.nix @@ -317,10 +317,15 @@ in lib.fix (self: { in if !(t.checkToBool res) then res - else { - ok = pred v; - err = "${prettyPrint v} does not conform to restriction '${restriction}'"; - }; + else + let + iok = pred v; + in if isBool iok then { + ok = iok; + err = "${prettyPrint v} does not conform to restriction '${restriction}'"; + } else + # use throw here to avoid spamming the build log + throw "restriction '${restriction}' predicate returned unexpected value '${prettyPrint iok}' instead of boolean"; }; }) |