pub type Tcl_SetFromAnyProc = Option<unsafe extern "C" fn(interp: *mut Tcl_Interp, objPtr: *mut Tcl_Obj) -> c_int>;
pub enum Tcl_SetFromAnyProc { None, Some(unsafe extern "C" fn(*mut Tcl_Interp, *mut Tcl_Obj) -> i32), }
No value.
Some value of type T.
T