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Errors at the top of an expression are printed normally:
nix-repl> builtins.throw "Evil puppy detected!!!"
error:
… while calling the 'throw' builtin
at «string»:1:1:
1| builtins.throw "Evil puppy detected!!!"
| ^
error: Evil puppy detected!!!
Errors in attribute values are printed inline, to make it easier to explore
values like nixpkgs where some parts of the value fail to evaluate:
nix-repl> { puppy = builtins.throw "This puppy is EVIL!!!"; puppy2 = "This puppy is GOOD :)"; }
{
puppy = «error: This puppy is EVIL!!!»;
puppy2 = "This puppy is GOOD :)";
}
Same for list values:
nix-repl> [ (builtins.throw "This puppy is EVIL!!!") ("This puppy is GOOD :)") ]
[
«error: This puppy is EVIL!!!»
"This puppy is GOOD :)"
]
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