lix/doc/manual/rl-next/enter-debugger-more-reliably-in-let-and-calls.md
eldritch horrors 3e1be9c530 Merge pull request #9917 from 9999years/enter-debugger-more-reliably
Enter debugger more reliably in `let` expressions and function calls

(cherry picked from commit c4ed92fa6f836d3d8eb354a48c37a2f9eeecc3aa)
Change-Id: I16d0cad7e898feecd2399723b92ba8df67222fb4
2024-03-09 03:37:35 -07:00

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596 B
Markdown

---
synopsis: The `--debugger` will start more reliably in `let` expressions and function calls
prs: 9917
issues: 6649
---
Previously, if you attempted to evaluate this file with the debugger:
```nix
let
a = builtins.trace "before inner break" (
builtins.break "hello"
);
b = builtins.trace "before outer break" (
builtins.break a
);
in
b
```
Nix would correctly enter the debugger at `builtins.break a`, but if you asked
it to `:continue`, it would skip over the `builtins.break "hello"` expression
entirely.
Now, Nix will correctly enter the debugger at both breakpoints.