nix-super/doc/manual/rl-next/better-errors-in-nix-repl.md

synopsis	prs
Concise error printing in `nix repl`	9928

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!