jade
272db8af1b
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
43 lines
1.1 KiB
Markdown
43 lines
1.1 KiB
Markdown
---
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synopsis: Concise error printing in `nix repl`
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prs: 9928
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cls: 811
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category: Improvements
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credits: 9999years
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---
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Previously, if an element of a list or attribute set threw an error while
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evaluating, `nix repl` would print the entire error (including source location
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information) inline. This output was clumsy and difficult to parse:
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```
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nix-repl> { err = builtins.throw "uh oh!"; }
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{ err = «error:
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… while calling the 'throw' builtin
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at «string»:1:9:
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1| { err = builtins.throw "uh oh!"; }
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| ^
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error: uh oh!»; }
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```
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Now, only the error message is displayed, making the output much more readable.
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```
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nix-repl> { err = builtins.throw "uh oh!"; }
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{ err = «error: uh oh!»; }
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```
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However, if the whole expression being evaluated throws an error, source
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locations and (if applicable) a stack trace are printed, just like you'd expect:
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```
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nix-repl> builtins.throw "uh oh!"
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error:
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… while calling the 'throw' builtin
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at «string»:1:1:
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1| builtins.throw "uh oh!"
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| ^
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error: uh oh!
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```
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