Maximilian Bosch
7c76964daa
When working on some more complex Nix code, there are sometimes rather unhelpful or misleading error messages, especially if coerce-errors are thrown. This patch is a first steps towards improving that. I'm happy to file more changes after that, but I'd like to gather some feedback first. To summarize, this patch does the following things: * Attrsets (a.k.a. `Bindings` in `libexpr`) now have a `Pos`. This is helpful e.g. to identify which attribute-set in `listToAttrs` is invalid. * The `Value`-struct has a new method named `determinePos` which tries to guess the position of a value and falls back to a default if that's not possible. This can be used to provide better messages if a coercion fails. * The new `determinePos`-API is used by `builtins.concatMap` now. With that change, Nix shows the exact position in the error where a wrong value was returned by the lambda. To make sure it's still obvious that `concatMap` is the problem, another stack-frame was added. * The changes described above can be added to every other `primop`, but first I'd like to get some feedback about the overall approach. |
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