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---
synopsis: Nested debuggers are no longer supported
prs: 9920
credits: 9999years
category: Improvements
---
Previously, evaluating an expression that throws an error in the debugger would
enter a second, nested debugger:
```
nix-repl> builtins.throw "what"
error: what
Starting REPL to allow you to inspect the current state of the evaluator.
Welcome to Nix 2.18.1. Type :? for help.
nix-repl>
```
Now, it just prints the error message like `nix repl`:
```
nix-repl> builtins.throw "what"
error:
… while calling the 'throw' builtin
at «string»:1:1:
1| builtins.throw "what"
| ^
error: what
```
|
