The display of "unbound variable" cannot be prevented
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bug
good first issue
- Dominant language
- C
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Description
```console
$ mrsh -c '(set -u; : $v) 2>/dev/null; echo end'
mrsh: v: unbound variable
end
$ mrsh -c 'foo(){ ( { (set -u; : $v); } ) }; foo 2>/dev/null; echo end'
foo: v: unbound variable
end
```
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