bug#7083: Why is `copy-tree's symbol-plist carrying side-effect-free error-free?

[MON KEY]

Why is `copy-tree' side-effect-free error-free?

(symbol-plist 'copy-tree)
=> (side-effect-free error-free)

It (potentially) `nconc's `nreverse's and `aset's the TREE arg recursively.

At revno: 45675 `copy-tree' was moved into subr.el from cl.el

,----
|
| committer: Colin Walters <walters@gnu.org>
| timestamp: Sat 2002-06-08 20:48:15 +0000
| message:
|   (copy-list): Moved here from cl.el.
|   (copy-tree): Renamed here from `cl-copy-tree' in cl.el.
|
`----

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