C64-dev/newLang/src/common/ifcalls.inc

; ifcalls.inc - interface call site constants (E06-S05).
;
; A call through an interface type knows the interface and the method at
; compile time, so it also knows the declaration slot: slot n is at
; table + IF_SLOT_SIZE*n (interfaces.inc). src/compiler/interfaces.s resolves
; that slot from the parser tables with iface_slot; the table pointer half of
; the fat reference is read at run time, so two classes answering the same
; slot reach different methods.
;
; A call site that cannot resolve a slot reports an error rather than emitting
; a call that would dispatch through whatever bytes sit at that offset.

.ifndef IFCALLS_INC
IFCALLS_INC = 1

IS_OK           = 0
IS_ERR_METHOD   = 1             ; the interface declares no such method

.endif