The optional third argument DOCSTRING specifies the documentation string
for SYMBOL; if it is omitted or nil, SYMBOL uses the documentation string
determined by DEFINITION.
+
+Internally, this normally uses `fset', but if SYMBOL has a
+`defalias-fset-function' property, the associated value is used instead.
+
The return value is undefined. */)
(register Lisp_Object symbol, Lisp_Object definition, Lisp_Object docstring)
{