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warn about destructors with setLenUninit in docs #24345

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warn about destructors with setLenUninit in docs #24345

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6 changes: 6 additions & 0 deletions lib/system/seqs_v2.nim
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Expand Up @@ -203,6 +203,12 @@ func setLenUninit*[T](s: var seq[T], newlen: Natural) {.nodestroy.} =
## Sets the length of seq `s` to `newlen`. `T` may be any sequence type.
## New slots will not be initialized.
##
## .. warning:: Assigning to the uninitialized slots can generate
## destructor calls. If the slots have garbage data, they can still
## be interpreted as well-formed, potentially causing crashes.
## To prevent this, destructor injections should be disabled in the
## context, currently possible via the [nodestroy pragma](destructors.html#nodestroy-pragma).
##
## If the current length is greater than the new length,
## `s` will be truncated.
## ```nim
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