= «thunk»; darwinMinVersionVariable = «thunk»; darwinPlatform = «thunk»; «84
    attributes elided»}
  ```

- Type errors include the failing value

  In errors like `value is an integer while a list was expected`, the message now
  includes the failing value.

  Before:

  ```
  error: value is a set while a string was expected
  ```

  After:

  ```
  error: expected a string but found a set: { ghc810 = «thunk»;
    ghc8102Binary = «thunk»; ghc8107 = «thunk»; ghc8107Binary = «thunk»;
    ghc865Binary = «thunk»; ghc90 = «thunk»; ghc902 = «thunk»; ghc92 = «thunk»;
    ghc924Binary = «thunk»; ghc925 = «thunk»;  «17 attributes elided»}
  ```

- Source locations are printed more consistently in errors [#561](https://github.com/NixOS/nix/issues/561) [#9555](https://github.com/NixOS/nix/pull/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: expected a string but found a set
  ```

- Some stack overflow segfaults are fixed [#9616](https://github.com/NixOS/nix/issues/9616) [#9617](https://github.com/NixOS/nix/pull/9617)

  The number of nested function calls has been restricted, to detect and report
  infinite function call recursions. The default maximum call depth is 10,000 and
  can be set with [the `max-call-depth`
  option](@docroot@/command-ref/conf-file.md#conf-max-call-depth).

  This replaces the `stack overflow (possible infinite recursion)` message.

- Better error reporting for `with` expressions [#9658](https://github.com/NixOS/nix/pull/9658)