Dear list,

With following MWE :

%%%

\startluacode

\stopluacode

\appendtoks\ctxlua{userdata.font_switch(\fontid\font)}\to \everyfontswitch

\setupbodyfont[mainfont, 9pt]

\starttext

Foo.

\stoptext

%%%

I get following error (commenting out the \appendtoks line makes the error to disappear) :

token call, syntax: [ctxlua]:1: unexpected symbol near '\'

1 >>  \startluacode

2

3     \stopluacode

4

5     \appendtoks\ctxlua{userdata.font_switch(\fontid\font)}\to \everyfontswitch

6

7     \setupbodyfont[mainfont, 9pt]

8

9     \starttext

10

11     Foo.