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---
synopsis: Source locations are printed more consistently in errors
issues: 561
prs: 9555
---
Source location information is now included in error messages more
consistently. Given this code:
```nix
let
attr = {foo = "bar";};
key = {};
in
attr.${key}
```
Previously, Nix would show this unhelpful message when attempting to evaluate
it:
```
error:
… while evaluating an attribute name
error: value is a set while a string was expected
```
Now, the error message displays where the problematic value was found:
```
error:
… while evaluating an attribute name
at bad.nix:4:11:
3| key = {};
4| in attr.${key}
| ^
5|
error: value is a set while a string was expected
```
|
