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add --debugger to rl-next list

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Ben Burdette 2022-05-25 10:38:13 -06:00
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doc/manual/src/release-notes/rl-next.md
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@ -24,3 +24,16 @@
Selecting derivation outputs using the attribute selection syntax Selecting derivation outputs using the attribute selection syntax
(e.g. `nixpkgs#glibc.dev`) no longer works. (e.g. `nixpkgs#glibc.dev`) no longer works.
* Running nix with the new `--debugger` flag will cause it to start a repl session if
there is an exception thrown during eval, or if `builtins.break` is called. From
there one can inspect symbol values and evaluate nix expressions. In debug mode
the following new repl commands are available:
```
:env Show env stack
:bt Show trace stack
:st Show current trace
:st <idx> Change to another trace in the stack
:c Go until end of program, exception, or builtins.break().
:s Go one step
```