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Using a read-only var name as a `for` loop var should be an error #4342

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krader1961 opened this Issue Aug 18, 2017 · 1 comment

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krader1961 commented Aug 18, 2017

While working on #4200 I noticed that if you run this:

false
for status in 3 2 1
    echo $status
end
echo $status

You see this:

1
0
0
0

Rather than this (or an error):

3
2
1
0

Contrast with this:

$ set status 1
set: Tried to change the read-only variable 'status'

@krader1961 krader1961 added the bug label Aug 18, 2017

@krader1961 krader1961 modified the milestones: fish-future, fish-3.0 Aug 18, 2017

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krader1961 commented Aug 19, 2017

I'm retargeting this for fish 3.0 because it is a backward incompatible change that can only be done in a major release. Now obviously anyone currently doing this type of thing is seeing unexpected, incorrect, behavior. Nonetheless, we should only fix it in a major release so let's make sure we do so for 3.0.

@krader1961 krader1961 self-assigned this Aug 20, 2017

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