lix/doc/manual/rl-next/better-errors-in-nix-repl.md
Jade Lovelace 272db8af1b doc: add release note credits and categories for all the changes in Lix
This does not add missing release notes, and it doesn't do anything
about the profiles feature we would really like to have so we can have
consistent credit.

Change-Id: I72a6f7acfcff85f380be17dac76501a6f4693776
2024-05-15 14:33:35 -07:00

1.1 KiB

synopsis prs cls category credits
Concise error printing in `nix repl` 9928 811 Improvements 9999years

Previously, if an element of a list or attribute set threw an error while evaluating, nix repl would print the entire error (including source location information) inline. This output was clumsy and difficult to parse:

nix-repl> { err = builtins.throw "uh oh!"; }
{ err = «error:
       … while calling the 'throw' builtin
         at «string»:1:9:
            1| { err = builtins.throw "uh oh!"; }
             |         ^

       error: uh oh!»; }

Now, only the error message is displayed, making the output much more readable.

nix-repl> { err = builtins.throw "uh oh!"; }
{ err = «error: uh oh!»; }

However, if the whole expression being evaluated throws an error, source locations and (if applicable) a stack trace are printed, just like you'd expect:

nix-repl> builtins.throw "uh oh!"
error:
       … while calling the 'throw' builtin
         at «string»:1:1:
            1| builtins.throw "uh oh!"
             | ^

       error: uh oh!