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lix/doc/manual/rl-next/with-error-reporting.md
eldritch horrors 87e6ac5eb7 Merge pull request #9753 from 9999years/print-value-on-type-error 
Print the value in `value is X while a Y is expected` error

(cherry picked from commit 5f72a97092)
Change-Id: Idb4bc903ae59a0f5b6fb3b1da4d47970fe0a6efe
2024-03-09 00:05:41 -07:00

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synopsis prs
Better error reporting for `with` expressions 9658

with expressions using non-attrset values to resolve variables are now reported with proper positions.

Previously an incorrect with expression would report no position at all, making it hard to determine where the error originated:

nix-repl> with 1; a
error:
       … <borked>

         at «none»:0: (source not available)

       error: value is an integer while a set was expected

Now position information is preserved and reported as with most other errors:

nix-repl> with 1; a
error:
       … while evaluating the first subexpression of a with expression
         at «string»:1:1:
            1| with 1; a
             | ^

       error: expected a set but found an integer: 1