[luatex] Missing log information for fonts when \tracingall

[Joseph Wright]

Hello all,

Another log-related issue. With

    \def\test{cmsy10 at10.0pt}
    \tracingall
    \global\font\testfont\test
    \show\testfont
    \bye

pdfTeX gives

    {\global}
    {\font}
    {globally changing \testfont=undefined}
    {into \testfont=select font nullfont}

    \test ->cmsy10 at10.0pt
    {globally changing \testfont=select font nullfont}
    {into \testfont=select font cmsy10}
    {\show}
    > \testfont=select font cmsy10.
    l.4 \show\testfont

whereas LuaTeX (TL2014) gives

    {\global}
    {\font}
    {globally changing \testfont=undefined}
    {into \testfont=select font nullfont}

    \test ->cmsy10 at10.0pt
    {\show}
    > \testfont=select font cmsy10.
    l.4 \show\testfont

Clearly the assignment happens: bug?
--
Joseph Wright