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we enter a debugger via builtins.break in the input file.
info: breakpoint reached
causing another debugger even should not nest, but simply
print the error, skip the breakpoint, etc as appropriate.
nix-repl> "values show"
"values show"
nix-repl> builtins.break 2
2
nix-repl> builtins.throw "foo"
error:
… while calling the 'throw' builtin
at «string»:1:1:
1| builtins.throw "foo"
| ^
error: foo
nix-repl> assert false; 2
error: assertion 'false' failed
at «string»:1:1:
1| assert false; 2
| ^
exiting the debug frame should allow another to open.
nix-repl> :c
nix-repl> builtins.throw "bar"
error: bar
and once again, more breakpoints are ignored.
nix-repl> builtins.break 3
3
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