Dear devs,

The example below crashes LuaTeX with a segmentation fault.  It is reproducible
with LuaTeX 1.10.1 7143 and LuaTeX 1.11.2 7226.  To this end I built 7226 from
source with --debugopt to get a backtrace, which can be found below as well.

Cheers, Henri

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\directlua{token.set_macro(-1, "foo","\string\\,")}
\show\foo
\foo
\bye