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nix/tests/functional/lang/eval-fail-genericClosure-operator-not-list.err.exp
Robert Hensing d262efc240 libexpr: improve error messages for builtins.genericClosure
Show which element(s) are involved at each error point:

- When an element is missing the "key" attribute, show the element
- When an element is not an attribute set, show the element
- When comparing keys fails, show both elements being compared
- When calling operator fails, show which element was being processed

This provides concrete context using ValuePrinter with errorPrintOptions.

Note: errorPrintOptions uses maxDepth=10 by default, which may print
quite deeply nested structures in error messages. This could potentially
be overwhelming, but follows the existing default for error contexts.
2025-11-06 22:28:49 +01:00

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Text

error:
… while calling the 'genericClosure' builtin
at /pwd/lang/eval-fail-genericClosure-operator-not-list.nix:1:1:
1| builtins.genericClosure {
| ^
2| startSet = [ { key = 1; } ];
… while calling operator on genericClosure element { key = 1; }
… while evaluating the return value of the `operator` passed to builtins.genericClosure
error: expected a list but found a string: "not a list"