[tex-live] TL2015 - missing \locbox breaks package forest

[jfbu]

Hi, 

I am not sure this belongs to this list. I don't know to whom report it.

package forest uses \locbox at one location, which comes from etex.sty

apparently something has changed with LaTeX 2015/01/01, hence
\locbox is missing when forest.sty needs it

ERROR: Undefined control sequence.

--- TeX said ---
<argument> \locbox 
                   \forest at temp@box \forestolet {box}\forest at temp@box 
l.18 \end{forest}


as for mwe, sorry if it is not minimal at all, I just copied
pasted the code from page 1 of forest.pdf doc

\documentclass{article}
\usepackage{forest}
\begin{document}
\pgfmathsetseed{14285}
\begin{forest}
random tree/.style n args={3}{% #1=max levels, #2=max children, #3=max content
content/.pgfmath={random(0,#3)},
if={#1>0}{repeat={random(0,#2)}{append={[,random tree={#1-1}{#2}{#3}]}}}{}},
for deepest/.style={before drawing tree={
alias=deepest,
where={y()<y("deepest")}{alias=deepest}{},
for name={deepest}{#1}}},
colorone/.style={fill=yellow,for children=colortwo}, colortwo/.style={fill=green,for children=colorone},
important/.style={draw=red,line width=1.5pt,edge={red,line width=1.5pt,draw}},
before typesetting nodes={colorone, for tree={draw,s sep=2pt,rotate={int(30*rand)},l+={5*rand}}},
for deepest={for ancestors'={important,typeset node}}
[,random tree={9}{3}{100}]
\end{forest}
\end{document}

Jean-Francois