[Chicken-users] Strange parameters in the runtime library

[Thomas Chust]

Hello,

I just found the following prototype in chicken.h:

C_fctexport void C_apply(C_word c, C_word closure, C_word k, C_word fn,  
...) C_noret;

I wondered why on earth there was a closure parameter and a fn parameter.  
Reading the sourcecode of runtime.c carefully reveiled that the closure  
parameter is apparently not used at all, so what is the reason for its  
existence?

Ciao,
Thomas