\group_begin: \tex_catcode:D `\*=11\scan_stop: \CodeStart \gdef:Npn\g*i{bar} \gdef:Npn\l*i{foo} \gdef:Npn\foo{somefoo} \fint_gset:Nn\g_gen_sym_fint {1} \fint_gset:Nn\g_ggen_sym_fint {1} \group_end: