+: procedure-params ( proc -- params )
+ drop pair-type car ;
+
+: procedure-body ( proc -- body )
+ drop pair-type cdr car ;
+
+: procedure-env ( proc -- body )
+ drop pair-type cdr cdr car ;
+
+: apply ( proc args )
+ 2swap dup case
+ primitive-proc-type of
+ drop execute
+ endof
+
+ compound-proc-type of
+ 2dup procedure-body ( args proc body )
+ -2rot 2dup procedure-params ( body args proc params )
+ -2rot procedure-env ( body params args procenv )
+
+ extend-env ( body env )
+
+ 2swap ( env body )
+
+ begin
+ 2dup cdr 2dup nil objeq? false =
+ while
+ -2rot car 2over ( nextbody env exp env )
+ eval
+ 2drop \ discard result
+ 2swap ( env nextbody )
+ repeat
+
+ 2drop ( env body )
+ car 2swap ( exp env )
+
+ R> drop ['] eval goto-deferred \ Tail call optimization
+ endof
+
+ bold fg red ." Object not applicable. Aboring." reset-term cr
+ abort
+ endcase
+;
+