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0b80935c22
This includes position information in more places, making debugging
easier.
Before:
```
$ nix-instantiate --show-trace --eval tests/functional/lang/eval-fail-using-set-as-attr-name.nix
error:
… while evaluating an attribute name
at «none»:0: (source not available)
error: value is a set while a string was expected
```
After:
```
error:
… while evaluating an attribute name
at /pwd/lang/eval-fail-using-set-as-attr-name.nix:5:10:
4| in
5| attr.${key}
| ^
6|
error: value is a set while a string was expected
```
45 lines
848 B
Markdown
45 lines
848 B
Markdown
synopsis: Source locations are printed more consistently in errors
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issues: #561
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prs: #9555
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description: {
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Source location information is now included in error messages more
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consistently. Given this code:
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```nix
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let
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attr = {foo = "bar";};
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key = {};
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in
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attr.${key}
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```
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Previously, Nix would show this unhelpful message when attempting to evaluate
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it:
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```
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error:
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… while evaluating an attribute name
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at «none»:0: (source not available)
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error: value is a set while a string was expected
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```
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Now, the error message displays where the problematic value was found:
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```
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error:
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… while evaluating an attribute name
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at bad.nix:4:11:
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3| key = {};
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4| in attr.${key}
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| ^
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5|
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error: value is a set while a string was expected
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```
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}
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