set_symbol_function 3643 src/alloc.c      set_symbol_function (val, Qnil);
set_symbol_function  755 src/data.c       set_symbol_function (symbol, Qnil);
set_symbol_function  867 src/data.c       set_symbol_function (symbol, definition);
set_symbol_function 4415 src/data.c       set_symbol_function (Qwholenump, XSYMBOL (Qnatnump)->u.s.function);
set_symbol_function 5073 src/lread.c      set_symbol_function (sym, tem);