I’m trying to define a symbolset:

\definefontsynonym [Webdings] [file:Webdings.ttf]
\def\WebdingsSymbol#1{\getglyphstyled{Webdings}{\tochar{x:#1}}}

\startsymbolset[webdings]
    \definesymbol [spider]    [\WebdingsSymbol{f021}]
    \definesymbol [spiderweb]    [\WebdingsSymbol{f022}]
    \definesymbol [sunglasses]    [\WebdingsSymbol{f024}]
    \definesymbol [award]    [\WebdingsSymbol{f026}]
    \definesymbol [ribbon]    [\WebdingsSymbol{f02d}]
    \definesymbol [plane]    [\WebdingsSymbol{f0f1}]
    % …
\stopsymbolset

\usesymbols[webdings]
\showsymbolset[webdings]
\symbol[webdings][spider]

The font is included in my pdf, \showsymbolset[webdings] lists the names, but the symbols never show up.
I also tried other fonts.
What’s wrong?

Greetlings, Hraban
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