set_symbol_function 3864 src/alloc.c      set_symbol_function (val, Qnil);
set_symbol_function  756 src/data.c       set_symbol_function (symbol, Qnil);
set_symbol_function  876 src/data.c       set_symbol_function (symbol, definition);
set_symbol_function 4372 src/data.c       set_symbol_function (Qwholenump, XSYMBOL (Qnatnump)->u.s.function);
set_symbol_function 5333 src/lread.c      set_symbol_function (sym, tem);