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Bug #15952

closed

Issue with Array#unshift, sometimes doesn't respect frozenness of array

Bug #15952: Issue with Array#unshift, sometimes doesn't respect frozenness of array

Added by luke-gru (Luke Gruber) over 6 years ago. Updated about 6 years ago.

Status:
Closed
Assignee:
-
Target version:
-
ruby -v:
Backport:
2.4: UNKNOWN, 2.5: DONE, 2.6: DONE
[ruby-core:93322]

Description

This should raise a FrozenError, but doesn't:

a = [1] * 100 b = a[4..-1] a.replace([1]) b.freeze b.unshift("a") # no error

There is a code path in ary_ensure_room_for_unshift where the frozen check is skipped. I'll hoist this check to the top of the function in a PR.

Thanks,

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