Thun/implementations/Prolog/docs/reference/i.md

(Basis Combinator) Append a quoted expression onto the pending expression. [Q] i

## i (Basis Combinator) Append a quoted expression onto the pending expression. [Q] i

    Q

Source

combo(i, [list(P)|S], S, Ei, Eo) :- append(P, Ei, Eo).

Discussion

This is probably the fundamental combinator. You wind up using it in all kinds of places (for example, the x combinator can be defined as dup i.)